@Kero Download any Gif from internet,
Then come back to this website,
Click on the upper right corner on you profile scroll down you will find User Avatar and there will be a option Choose Image click it select the Gif from your file manager that you downloaded after choosing it you will have to click on Upload button and.............
Congratulations 👏🎉 It's done.
Spoiler!
You shouldn't have seen this.