How do people make edits on instagram?

A lot of people do really cool edits where they like turn their tongue tye-dye or make their sunglasses lenses galaxy. How do they do that? People always ask how they do that but they never say. I guess they want to keep it a secret but obviously a lot of people know how to do it, so I was wondering what app it was on iPhone.

I always use Fotor, http://www.fotor.com/

to edit my photos before I post them.

You can try it, too.

Fotor is a free photo editor and it is

really easy to use. You can download on your iPone or

do it online.http://www.fotor.com/iphone/index-pes.html

With Fotor, you can add photo effects as you like.

And you can also make collage or add text to pictures.

Do hope it helps.