1999 Chrysler Grand Voyager alarm reset

I had to take the battery out of the van t fix another problem and when I put the battery back in a alarm started going off and the van wont start even with the alarm going off it must have disabled the egnition how can I reset the alarm to get it to start? I dont know if the alarm is after market or bought that way oops imfigured it out can I get a refund