simple bbcode

[gazken]

i just wanted to add an animated gif to some posts using bbcode, i have uploaded the gif to server but now struggling to make it work in bbcode manager.

Title: Picture
BB Code Tag Name: picture
Replacement: <a href="www.yoursite.com/picture.gif</a>
Example: [img]picture[/img]
Use Option: "No"
Remove tag if empty: Yes.

can someone tell me what i'm doing wrong?

really new to this if someone can help with simple explaination, thanks