Searching the forum is sometimes faster than waiting for a response. And there aren't alot of Cricket users here. I just did a search for "cricket activate" and came up with this but don't know if it will help you or not..
http://forum.ppcgeeks.com/showthread...icket+activate
I've never actually activated a phone before, always bought it at the store and they activated it. Doesn't Cricket have any stores? Hopefully a Cricket user will respond. Good Luck.