Important: If you turned on iCloud for Pages (in Settings on your iOS device), deleting a document from iCloud removes it from iCloud and from all other devices and Mac computers that use the same iCloud account.
In the document manager, tap Edit.
When the documents begin to jiggle, tap the ones you want to delete.
To deselect a selected document, tap it again.
Tap 
, then tap Delete Documents.
To cancel, tap anywhere in the document manager background, then tap Done.
If you open an existing document, edit it, then decide you don’t want to keep any of your changes, you can revert the document to how it was when you opened it.