Hello and welcome!
The standard first question we should ask is, have you read and "studied" the manual?
I do not have that radio but just looked it up and read through the manual and it's reasonably well written in good English.
The first thing to learn is how to navigate the menu and successfully make changes to settings. Practice changing things like squelch levels and turning on and off the Rodger beep or the display brightness etc.
The F button brings up the menu, the up and down arrows scroll through the options, F to select the option, up down to chose the setting to change, once chosen F to confirm then A/B button to exit menu. (That is clearly described in the manual)
Once you are comfortable with getting around the menu and making settings changes you can move on. You really need to know how to work the radio.
Couple of other points:
In order to make Programing changes to a channel you must be on that channel.
To transmit (TX) on GMRS channels you must be in "channel mode" not LSO mode (called VFO by most others) which is frequency mode).
LSO is for "listening only" to non GMRS channels/frequencies.
GMRS frequencies are channelized to make it easier. Rather than memorizing say frequency 462.5625 its easier to just remember channel 1.
Hope this helps. When asking further questions give as much info as you can. Details matter with radio.
Good luck!