Custom UI Setup For Dummies

 From:  777RAVEN777
9586.1 
Hi guys - this has probably been answered innumerable times before - but after following a rabbit trail of vague hints, I can find no clear instructions on how to set up the custom ui.
I downloaded it.
I extracted it.
I even put it into the Moi directory.

No results.
If I rename it 'ui' I do get a nice blank screen though :)

Are there some magic words I need to chant?

Yours in breathless anticipation