There are one or two bolts(or nuts/studs) on the underside that are very hard to see....especially when it's all together. Get a mirror or something and check under there to make sure you didn't miss one. The studs sort of hold it in place so it might take a little force to pop it loose. Just don't get too carried away and break something.

That front stud is a PITA also. First time I took mine apart I had to just use a pair of vicegrips on the stud to get it out....totally ruined it. I replaced the stud with a long bolt so I would never have to deal with that stupid thing again.