How to change iCloud Apple ID on iPad

I had set-up my iPad with an Apple ID for iCloud, when updating the device to iOS 5. Now I need to use other Apple ID's that I typically use for purchasing apps. But the iCloud Apple ID is grayed out.How to change iCloud Apple ID on iPad* Tap Settings > iCloud. * There is a big red "Delete Account." at the bottom of the screen. Tap it.* It will sign you out of iCloud. And then you can sign-in