[Elecraft] Help! K3 data exit?

[H. Cary III]

I need reflector help!
I love my K3 but it seems to be smarter than I am.  Earlier this week I was working PSK-31 on 10 and 15 meters.  Now with the contest this weekend, I want to work USB on those bands but the K3 is in DATA Mode and I can't figure out how to exit and get USB back on 15 and 10 meters.  I've read the operating manual about primary controls on page 13 and about DATA Modes on page 31 but still find no reference to how to exit.
I figure it must be simple but it sure has me stumped.
Can anyone help? I'd sure appreciate it!
73,
"H" Cary, K4TM
K3-100 #178
hcary at wclynchburg.org