As K31 said, you should download from the radio first. This will force Chirp to recognize what settings are possible for your radio.
I don't believe you can stop the transmit function with a change to the offset value. The safest thing to do is set the transmit to a frs freq. Not legal, but better than transmitting on a police frequency.
Baofeng has its own software free to download. The Baofeng software allows you to set all of the configuration settings that Chirp does not. The radio comes with default settings that are for commercial and should be changed for amateur use. You can change all of them on one screen with the Baofeng software. The main difference with memory programming between the two is that with Chirp, you set an offset for transmit. With Baofeng software, you enter the transmit frequency. The software copies the receive frequency to transmit by default and then you edit it. This is a pain compared to just entering the offset but does make it easier for satellite since they sometimes use vhf for receive and uhf for transmit, or visa versa.
I have the 8 watt version bf fh8hp. This is $62 from Amazon and has some firmware improvements.
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All good to know. I forgot to recommend downloading first. I saved that file as a backup just in case I screwed something up.
As for setting the offset to "off" I tried several methods to make sure I didn't accidentally transmit including setting the offset value outside of the radio bandwidth capability. None of those methods worked using chirp. However I did find a post on the web suggesting to set offset to "off" and this worked. When I press the PTT the unit just beeps. I also tested it buy monitoring the same frequency on another HT to ensure there was no transmission and it worked. YMMV