textureing in an object

im making a base for my game and im trying to texture it, ive done the outside of it but when i try to do the inside nothing happens and it just textures the out side even tho i have selected the inside faces of the object

Do you have separate interior walls?, one face can only have a single texture on it, and that texture will only be displayed on the side that the normal is pointing ( i think you can have double sided faces, but with those the same texture would be on the inside as on the outside anyway).

In order to have two textures you will need to have 2 sets of faces, one pointing in and one pointing out, eg a slightly smaller cube within a bigger cube.

I hope you get the idea, I’m a bit rubbish at explaining.

nope you did good with explaining im pretty bad at trying to explain my self as well and yes i only had one sided faces i did’nt hve any inner faces