How to put a gif as a forum signature

[Shintao]

Ive been trying to put a gif as my forum signature to no avail after looking at guides to do it,so if anyone could help me out it would be great.
I know this isnt a large issue,bug or anything but still would be great to finally know how to do it.
Sorry for the kind of stupid question and thanks in advance!

[Nea]

Code: [Select]

[img] gif url here [/img]

[Shintao]

Code: [Select]

[img] gif url here [/img]

Thanks a lot! ^.^