Go to your Avatar and bring up the Avatar Editor. Here, you can now select one of the slots on the ‘Equip Emotes’ wheel and add any custom emote or dance you’ve purchased from the Roblox Store.

Roblox is more than just a platform that lets you play a wide variety of games; it also lets you create dream games for PC, Xbox, and mobile. Take your first step into Roblox Studio game ...

I can't teach you how to dougie cause then you'd get all of the UGCs for free, so instead use Dance for UGC codes to get some.