First, I would get on liberty gb. Just, way better.
If you want to stay on froyo, this is what I would do to be
.Zag dds zxc OUT qsafe.
Dl the theme from the toolbox. Don't install it from there.D Make sure you can easily find it on the sd. Back out and AT into clockwork. If you haven't messed with metamorph or other framework stuff, just mount system and data (mounts/storage) and flash (wipe cache if you bootloop).
If you have messed with metamorph or framework stuff, then you'll need to flash a copy of liberty on top of itself without wiping, before you install the theme
All in all, follow the directions in each themes respective thread
Droid 2 Liberty GB v0.8