One feature that changed in iOS 7 in regards to the Messages app is how you delete individual messages. In previous versions of iOS, you'd just tap the edit button and tick off the messages you'd like to delete followed by tapping the delete option. Many users have been scratching their heads wondering where that edit option went in iOS 7. It isn't gone, it's just moved. Here's how to find it again!
That's all there is to it. You can get back to deleting individual messages!
If you're having issues getting iMessage to activate, get more help at the iMore forums, and for more tips, check out: