This is really easy. The only confusing part is that you'll be determining the height of the object from the optical axis (or its radius). The object (OBJ) height is
The height of the first surface (the AST surface) is
The height of the second surface should be the height of the previous surface
The height of the image surface can be left blank. OSLO will calculate it for you.
So, once again, add these heights into the table describing your optical system.