Hey @(you need an account to see links)!
You go to your settings on the top right corner of Clraik.
Then go to Edit Signature on the middle left.
Have the .gif link ready and then put it into your signature.
If you need more information I can help you.
---------- Post added at 03:12 PM ---------- Previous post was at 03:10 PM ----------
Use your insert image button to insert the .gif into your signature. It's very easy.