how do i equip my models

Models?
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Expand on what you mean by "my models" please. :S

I believe he means textures? If you're talking about textures, you need to buy the item from the store and then make them active in your inventory. You should have the option of applying a picture to the texture and it may take a couple minutes to update in game.

If you don't mean textures, then you need to specify what you mean by "models", haha.