I am having difficulty setting up triple integrals. Perhaps an illustration would help.

Suppose f(x,t,z) = (2x - 1)yz^2, S is the solid in the first octant bounded by x + y = 1 and z^2 = x^2 = y^2.

I really don't understand how to set this up. Could anyone explain it to me? Thanks for any help you can be.