Duping?

How many methods r there to duping? I've seen one with muledump, haven't really understood if quite clearly. I want to try it ;p Pm me if you know one or more ways, don't really have anything good atm, prolly dupe some speed/dex for myself to max xD

Lel, my first language isnt even english, but I still understood instructions fully, and got it to work. And yes, it is one with muledump, it shouldnt be that hard to figure out.

Do u have skype ?