I tried. Couldn't get it to work though. Kept on getting a "Invalid Vendor ID" message.
XDA forum just gave conflicting advice so I wasn't sure what to do.
I tried rolling it back to NODO which didn't work but in the process of getting it back to Mango a HTC update from Zune appears to have given me the latest version. I now have the "Help and How to" in the apps section.