Honestly, just add it as a new channel. Enter the frequency, make the offset "plus", and add the tone to CTCSS TX/RX. I personally like to use T-SQL for the Tone mode so I hear just that repeater on that channel. Program this through the CPS is easiest. Otherwise with the 935G+ you have, you can use the channel wizard. If you don't know how to use that, maybe search youtube for a tutorial. I am pretty sure I saw one at one point in time.
And to see frequencies, you need to change the channel mode to CH+Freq in the settings. Again, easily done in the CPS.