How do you photo shop a picture without downloading anything?

The correct Word is "Photoshop." Photoshoping is a Word used specifically to refer to using the Adobe Photoshop software to edit your image, and Photoshop is not free, but you can get a 30 day fully functional trial for it by signing up for the trial of Adobe's Creative Cloud service. There are free alternatives to Photosphop if using Photoshop for your image editing is not absolutely critical. Gimp is constidered one of the best free alternatives, although it might be lacking some of the features Photoshop has.