What websites or apps (on Iphone) do I use do make cool fan edits?

On Instagram I have an ariana grande fan account and its not that good bc I don't know how to make good edits, or where. Help me?

Here's a couple examples: http://instagram.com/...kittyloves

http://instagram.com/...utupbutera

It's people's accounts but it has cool edits so click and maybe help me.

Alot of different ones to add text and other stuff, I use this one https://itunes.apple.com/...?ls=1&mt=8 but there are many others that do these things.