Help on replacing pegs

Yeah, my dad bought me the hair dryer, but my mom says it's too much electricity.
So, I had to deal with boiling hot water, and I learned something again!
Don't stick your wounded finger into boiling hot water.

Mukami's way is easiest, just heat the area so the plastic gets flexible and it should be easy to work with.

Never Mind.

I figured out how to work the damn thing and I replaced my Moon Knight's elbow.
In the process, I also found out that Hasbro SM3 Stuff is actually capable of doing something.
I used Venom's elbow to replace Wolverine's and now a crappy figure is just fodder!
I win in all sorts of ways!

If you're talking about the little pegs at the elbow/knee joints:
1. Take a hairdryer and heat the upper arm part (usually 30-60 seconds)
2. Place the peg in one side of the upper arm.
3. Side the lower arm onto the peg.
4. Get a small flat screwdriver and push (not force) the peg into the last peg hole.
5. You may have to try this multiple times, but it's always worked for me.

Edit: Try not to pull or stretch the peg holes, that will loosen the joint.