HPS - Billboard Wall Mesh 1 Prim

The mesh shape is actually good.
It has 3 faces, yes. Face 1: the red area. Face 2 : the blue area. Face 3: the white area.
You want to select face and put your own texture on Face 3 (the white area) but it shows your textures on all sides of this area, that is front and back and also on both sides, which looks like sh*t.
I want a different billboard for free or get my money back. This billboard is useless.