How to texture faces of a slab or 3D solid

[GeneDavis]

I don't know how and need guidance.  I made a corner shelf in a shower using the slab tool, and cannot figure how to address my situation, which is one texture on the edge, and another on the top.  Two different.

 

I converted it into a 3D solid and that did not help.  I want the same 3x6 subway tile on both these faces, and know I have to make a version for each to handle direction and origin.

[Joe_Carrick]

4 minutes ago, solver said:

Explode the solid.

Exactly.  You can then edit each face independently.