Turn the unit off. Then press and hold the
page back button (bottom one) and while holding it turn the device on.
After the bookshelf gets rearranged, tap the
top left menu (ebook guy) and then tap the
Info icon. Tap the
more icon (twice) and you should see the hidden menu. There is a
refurbish icon that will wipe out any existing registration info. Do so now.
Afterwards, just power off and then power on again. Now under the
Info icon you should see "Not registered yet" for User ID.
Now connect to your
Online Bookshelf with your (new) ebookwise User ID.
This
link explains this the Registration process more succinctly: