Get last (beta) version and read the readme:
http://archive.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,5,2416
QUOTE
(...)
- Number of drives: it's possible to choose from 1 up to 4 drives. It needs to reset emulation to take effect. IMPORTANT! To insert adf disks into each drive (in Filemanager section), the buttons are:
B for DF0:, Y for DF1:, A for DF2:, X for DF3:
(...)
- Kickstart: you can choose between 1.3, 2.0 and 3.1 kickstart version. To take effect it needs to reset the emulation. Moreover, the kickstart roms must be put into "kickstarts" dir and called "kick13.rom", "kick20.rom", "kick31.rom". If there aren't during the uae boot, the emulator will search "kick.rom" in the main folder
Edit: Later answer
Thanks for that.... somehow I didn't see that readme file, there's a couple of readme files that come with that version, just didn't look at the right one
cheers