WSFV286

He's a clown that does not know what he's talking about and a shill that only says what his Chinese handlers tell him to say.  I saw a licensed H.A.M. radio operator proclaim all this right here in this forum so it must be true because the guy had a license!

He never told you to buy a Kenwood!

You can find power supplies on Amazon that put out the correct 13.8v DC and have a 10 amp accessory port (cigarette lighter) that will work fine for a 20 watt radio. I suggest buying a 30 amp power supply just incase you ever decide to get a 50 watt radio to use as a base station.  
Here is one example: 13.8V 30A Bench Power Supply, Analog DC Power Supply with Cigarette Plug, Ham Radio Regulated Switching Power Supply, Noise Offset Control I know its a generic brand, but that exact power supply is sold under various names and has a good reputation.
One thing to remember is that most, if not all, power supplies are marketed at their peak power output. The continuous power output is between 75 and 80 percent of that. SO a 30 amp power supply is really only good for 22-24 amps of continuous use. A 20 amp power supply is good for 14-16 amps continuous and a 15 amp power supply is good for 10-12 amps continuous.

I am a big fan of its less expensive cousin: the Radioddity DB20-G

Aside From My Kenwood, Motorola & Vertex Standard UHF Radios I Use Daily For All My GMRS Use, I Do Have (8) Retevis RB75 Units That I Use For Hunting, Fishing & All Other Similar Outdoor Activities. They Are IP67 Rated, 5Watt, Have A 4500mAh Battery, Durable, Talk Good & Are Fairly Priced. 
Perfect Outdoorsman Radio & You Won't Cry If Someone Trashes One Out.
https://www.retevis.com/rb75-waterproof-long-standby-gmrs-two-way-radios-us
Also Available At Amazon.......

I have the 9G and it’s been fantastic. It’s not the most power option, but with 771 G antenna it’s a great radio. 

I have the GT-3WP which is the ham version.   It's a good radio for the price.   Had it out in the rain several times.
My coworker has UV-9Gs and he likes them as well.
 

I purchased  a UV9G for a neighbor's birthday. We used our radios when we lose power. He is happy with it. We have used the radio in the snow and rain and it has held up well. Another friend just bought two of them to use for his family. He is happy with them. I think they are good radios for the price. I don't personally own one. I have several  Wouxuns.

Yes, unfortunately, the manual is too brief, but there is a large user base of these radios given the large feature set and the relatively low price.  Many of us have two. And as you note, many here are willing to share their knowledge with others, especially newbies.
So you have already discovered that if you hit the FUN button, it opens up the MENU at the bottom of the screen.  There are 1 through 30 MENU items available here, but as you scroll through them, some are missing due to the Part 95E certification for this GMRS radio (and are only available if the radio is "opened up" from its GMRS restrictions).
You can scroll up or down through these MENU items by using the V/M key as UP and MAIN key as DOWN.
As you discovered, MENU Items 1 through 3 set Tones, either Analog CTCSC or Digital DCS; and Item 1 sets the Transmit Tone; Item 2 sets the Receive Tone and Item 3 sets both the Transmit Tone and Receive Tone to the same value at the same time (sort of a shortcut from having to use Item 1 and then Item 2).
I recommend that new users only set the Item 1 Transmit Tones required to access Repeaters and leave the Receive Tone set to OFF.  So yes, you may hear stations or repeaters off in the distance that you may like to avoid, but, if a mistake is make with setting a Receive Tone, you will hear NOTHING!  So better to hear too much for now.
Here is how Menu Item 1 works:   The Default state is OFF; no tone is sent.  If you hit the MON button once, it turns on the ability to set an Analog CTCSS Tone, starting with 62.5 and using the UP Arrow Key and Down Arrow Key to scroll through all the available Analog Tones up through 254.1.
If you hit the MON key a second time, it opens up a non-standard ability to create your own CTCSS Analog Tone, which I recommend that you do not use.
If you hit the MON key a third time, it opens up the ability to set a DCS Digital Tone. There are two types of DCS Digital Tones: N (Normal) and I (Inverse) and most repeaters that use DCS Digital Tones use the Normal Tones.  Using the UP Arrow and DOWN Arrow Keys to scroll from 000 to 777 in the "N" Mode and if you hit the MON Key a fourth time, it allows you to scroll DCS Digital Tones from 000 to 777 in the "I" Inverse Mode.
Hitting the MON key a fifth time will circle around back to the default Tones Off again.
Once programmed, push the FUN button again to exit the Menu.
NOTE: Once you program a channel, either manually or with the CPS programming software, you can change the Tone for a specifically programmed channel using this method, but once you change channels or power the unit Off and then back On, it will default back to the programmed Tone.
Good luck and enjoy a great little radio!