just like a cv-joint on a car theres a snap ring in a groove at the end of the stub shaft. i assume you took the spindle and all that fun stuff off. if your lucky you can just tap the back of the flange a few times and it will pop out of use RexNfx400's prybar method. make sure that snapring is on the axle when it comes out if not go fishing for it with a pick. i hope it just pops out for you. i've seen guys break the axle because there was no other way to get it out. good luck