Some pics would help a lot.
Is there a tiny hole or slot on the outside of the lever?
If so try unlocking the lever, then turning the lever as far as it will go in one direction. The press in the hole or slot with a tiny piece of metal such as a dulled nail, or a screwdriver. Try pulling the handle off. If this doesn't work, try turning the handle the other way the press in.
Also see page 20 on this manual, I know its for kwikset but it might help.
http://www.kwikset.com/Trade/Literature/Resources/Rekeying%20Manual.pdf#search=%22rekeying%20leverset%22
It might be completely different than this, as stated a pic will really help.
Unbreakable