Okayy.. So NO THIS QUESTION ISN'T REALLY FOR ME.
Just so you people know I don't do this type of stuff. But My Friend [Alice] has a pic and you knoww how like there's a pic with proof like the URL of the person written on their hand and stuff for proof or they put "im real" then their URL under it. Etc, Weell she wants to know how to edit it??

Sorry, we don't assist with illegal activity here at AMHD.

That's illeqal??

Depends on where the pics are from. If they are from a photographer then tampering with the watermark would be illegal.

No, its just like normal people like me or her etc,

If you want to edit an image file that you own the rights to, you can use anyone of several image editing applications to add elements to the picture.

But what do I go too?

That depends on the application. Try looking up adding text in the Help.