Digital BW, The Print

Well the other night I managed to change the printable area from it's 
usual .55 side and top allowances to .1something.  

Now I don't know how to change it back.  At some point I had gained 
access to the margins box that are now dimmed.  Have PS6, PS7 & Word 
if anyone has an idea.  Meanwhile I'll rummage through some books.

Thanks,
Cleavis