Above all Saving your work is importent. Its simple within Nice Page just click the little
save symbol(top right highlighted) it will show "saving" then "saved" when all is done.
Once you have saved your work, click the "X" top right and you will be re-directed back into Joomla. If however your are presented with a dialog box that says "leave Page" or "Stay on Page"
its because you have made some changes and DID NOT SAVE THEM.
Once back in Joomla you must ONCE more click "Save and Close"
Now all that is left is to "logged" out of Joomla, scroll to bottom of page and click "logout"