Using Manual faders on Ion Xe20 board

I have replaced my old Element I Light Board with a nice new Ion Xe20 board.  But I can not figure out how to use the manual faders on the new board.  The User Manual is of no help -- it only describes the procedure for using manual faders on the ELEMENT Board, and I already know how to do that.  How do I select channels so that I can manually adjust intensity with the faders?  What is the "Fader Page" button for?  Where can I get a user manual to help me?