I think this is impossible. not 100% sure though....
https://gph.is/1g7unR9It's not impossible, but you can't do it as a newbie without the copper membership. (This is done to prevent abuse. You also can't post normal images as a newbie.)
There should be no issue for Jr members to do so though..
If you still feel the need to have access to posting images/gifs as a newbie, read more about the copper membership here,
https://bitcointalk.org/index.php?topic=2385104.msg24371150#msg24371150 which grants you these abilities among some other stuff.