ICloud popup message will not go away. HELP!!

Hey guys, I'm trying to get my popup message reminding me to back up my ICloud to go away. I've hit the "ok" button about 100 time and it's still there. I thought at first there was something wrong with the touch screen but that's not the case. Below is the ICloud message I can get to go away. Can someone help? Thanks!

ICloud Backup

This IPad hasn't been backed up in 2 weeks.

Back up happens when this I pad is pluggen in, locked, and

conneced to Wi-Fi.