1. $moddir/addons/amxx/configs/amxx.cfg:
Code:
// Amount of reserved slots (for more details see comments in a plugin source)
amx_reservation 2
Change this.
2. If you have statscfg.amx enabled, type "amx_statscfgmenu" in your console to get a menu front end for stats.amx. (Hope this is what you're searching for as I didn't really understand your question.

) For stats to work you'll at least need one stats module and stats.amx - statscfg.amx is recommended IMO.