You should be able to create a user in your staff panel.
After you do that i believe you go into like.... battletent.php or something like that and add the user ID of the NPC you created into the NPC section. I'll take a look again in a few and tell you exactly how.
ok i found it
go into battletent.php and find:
$h->endpage();
die("");
}
under that you should see something like...
$bots=array(7,8,9,532,533,534,535,536,720,721,722,585,820);
$moneys=array(1000,5000,10000,50000,100000,100000,100000,100000,1400000, 1400000, 1400000, 5000000, 10000000);
the 7,8,9,532,534 etc is the USERID of each bot, just delete those and add the ones of the bots/npc battlers you created.
the number under that like 1000,5000,10000 is how much money you make for each NPC. for example. NPC 1 aka ID number 7 will give you 1000 money, npc2 aka ID 8 will give you 5000 and so on and so forth.
Hopefully that explained your question.