The best way to contact other users are the forums. To get a more extensive help you can also Get Support with other resources.
The available forums are:
|AdvanceMAME||Help for the AdvanceMAME and AdvanceMESS emulators (advmame/advmess).|
|AdvanceMENU||Help for the AdvanceMENU frontend (advmenu).|
|AdvanceCOMP||Help for the AdvanceCOMP recompression utilities (advpng/advmng/advdef).|
|AdvanceSCAN||Help for the AdvanceSCAN roms manager (advscan).|
All the forums accept anonymous posts and allow anonymous search of the archives. If you register a SourceForge account you can also be notified of new messages.