How to add custom textures

[Piggieplayer]

Good day to you!

I need some help with the creation kit... From fallout 4

I am currently making a mod whitch adds extra content to the Nuka world dlc

I am working on a new actor, The nukatron promoter who has all assets from the original nukatron, exept for his texture, Instead of red, he'll be white.

But I'm having a lot of trouble giving him a new texture, I know how to make the actor and give him anything I want him to have.

The only thing That I want to know is how to add my custom textures on the model in creation kit, to use existing models, but with custom textures

Thanks in advance!