It can be done. You just need to know the passcode to get into programming.
Press the green key on the left. Press the down arrow twice to get to Utilities.
Press the green key again to Confirm.
Press down arrow twice to get to Program Radio.
Press the green key again to Confirm
The passcode is 00000000 – that’s eight zeroes.
Now keep in mind you’re modifying the memory channel you were on when you first went to program the radio. Everything is pretty self explanatory. Just know that CTC is CTCSS codes for non-digital repeaters.