Here are the instructions on how to do it:
To add your swap list, wish list and TBR to your signature follow this:
1. Find the link to your swaps: go to the main site, click on My Profile, then View your public swapping profile, and then you need to click on View All User's Books, which will provide you with the link to your books in the address bar at the top of the screen - it looks something like this - http://www.readitswapit.co.uk/UserBooks.aspx?UserID=457
2. Copy the link from the address bar at the top of the screen, and then go back to the forum and click on your name at the top right hand corner which will take you to your profile. Click on the tab About and under your signature paste the link.
3. Either side of the link you need to put the following (without the spaces) - [ url = put link here ] My Swaps [ / url ] - This should then create a link in your signature.
4. For wishlists and TBR's, you need to find the link to your wishlist/TBR thread, and do the same as above, again without the spaces.