2012 400 Sportsman Rear Boot

I have a rear ripped boot i"m trying to change and i can not figure out how to separate the the axle from the knuckle. so i can take the ripped boot off and put the new one on. I have been on you tube to see if i can figure it out. the only one i can see is a 500 and that says it has a snap ring on the axle. I do not see any snap ring on mine axle any help would be appreciated.
Thank you Lori