We'll start from scratch in case you are not sure how to enter a frequency from the get-go. I'll assume that you are on firmware v01.02.046.
Have he DM32 set to one of the VFO's (a or b)
Type in the receive frequency of 153.92000 (this is what the RR database shows for MODOC BARN)
As long that radio accepts the frequency, you are ready to proceed to the next steps:
Push the menu button, and select settings
move the cursor to "channel settings"
Select #3: VFO Save to CH
Once you have done this, change the radio from VFO to channel memory mode. Select up the channel you just saved.
Bring up the channel settings menu again.
Select #2 "TX Frequency" and enter the repeater input frequency (I don't know what that is so you or your friend will need to find out).
When that is entered, follow the same process to select "CTC/DCS" and then "RX/TX CTS/DCS". Enter the PL (or CTCSS) for the repeater.
Make sure the channel is set for ANA or analog mode. If not, go back into settings and select "Channel Type". This is where you select analog or digital mode. Obviously select analog.
Make sure to select "OK" every time a selection is changed.
Once you have the TX, RX, and CTS set, you should be good to go. You'll just need to look up the specifics for the repeater input and PL setting.
I hope this helps you.
Randy
PS: The others are just trying to help by warning that using a very inexpensive radio for 1st responder critical communications environment is not a good idea. But based on your comments about it just being a basic way to keep in touch, then it is understandable. The radio is not type accepted to be used for this type of communication (as long as he knows that).