This is actually REALLLY easy. Just follow these simple steps.

First, open up your signature.
Click on your name, then go down to signature.





Then, click on the BB Code button in the top right corner.


Here is the hard part.
You need to make your "code" for this to work. The Code:

Copy This:
[URL=' '[/URL]

Example:
[URL='(This is where you put the website of your clickable picture)' (Paste your IMG link here)[/URL]

And Boom! I use this site to convert my pictures to the .PNG form. This is the image link.
TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
That is what you want.

Pick your file. Press Upload Now. Select the code for forums and message boards. COPY THIS LINK.


There you go! Hope it helped!

-Dboy

 

well, I put a picture, I highlight it, and I link it.