x,y,& z parametric equations and 3-d plot

Greetings,

I am trying to build a mobius strip in Prime 2.0

I have, what I believe, the equations in x, y, & z defined (found at Wolfram Mathworld), along with the other variable required.

The trouble is plotting the equations.

Attached is the file with what I have so far.

Any clues as to how to build the surface would be appreciated.

TIA,

P. Quint