Profile editing..

^its very simple, you’ll just need to find an album to put them away then right click the gif you want,to find that address which lead straight to that gif,Paste it when you edit your profile. There is an icon for editing picture or gif.paste it on source

OK, so go to Menu [Me] -> Edit Profile -> Tab. / General /, then scroll down to "Any Favorite Quotes"...
To add a gif there, copy & paste the link of a gif you found on any website (without spaces):
https:// media.tenor.com/images/460bd913a1795ce83053ca3e98b5cd6c/ tenor.gif
It can be done from a phone but it may be a bit trickier with phone's abilities to copy & paste.

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from Potato's wall :
Sorry if I'm not expressing myself well > on "General" > my favourite quotes, I think the issue is that I'm on my phone and not on my computer? Because I can't copy and paste that. But it wasn't important I can live without it hehe