I found how to enable textures in settings, but it is still applying one texture to the entire model and is doing so where the pixles are huge, and only allows me one image

Hello.
I have a simple model that is just the pyramid primitive, and I want to to apply two 16x16 images to it. one called "side" that is copied to all 4 pyramid sides, and a "base" that is the base.

I can't even manage to see how to use any texture at all with this model form, it only seems to ...