Casio CZ/ VZ/ FZ - Pro Series

I have a Casio VZ8m.  I have the PowerPlay manual and it says the 
VZ8m has 64 internal preset locations and 128 preset locations (PST1 
and PST2).  But I cannot (to save my life) find out how to swith from 
PST1 to PST2 to INT!!!!!!  Arrrghhh.  I fell like a dummy but I have 
9 other synths and I can usualliy find my way around them.  I have 
tried to cursor over to PST while in normal mode but the cursor will 
not move.  Any help????