Link in signature.

I'm not sure exactly what you are asking.
If you want your sig to be a link by clicking on the picture then it is very simple.
When you edit your sig click on the picture then click the insert link picture which is the earth with a chain and insert the link.

 

Probably wrong forum. But I think its this:

url here but in front of the last URL add a /

 

[url=LINK] [/url]