The error that my icloud account is full and need more storage stays on the screen of my Ipad2. It won't allow me to get more, turn it off or do anything on it. Help!!

Reset: Hold the Sleep/Wake and Home buttons until the screen goes dark and the Apple logo appears

Then do some house cleaning in iCloud (or purchase more storage)

Settings > iCloud > Storage & Backup > Manage Storage > Select a device if more that one > Show All Apps and turn off some apps that you don't need or care to be backed up.

Also, connect to iTunes and empty your Camera Roll onto your computer. Photos & videos tend to eat up a lot of space.

Also be sure that it's not the **device** itself that is low on storage.