Playlists in Signature

Probably because your trying to put the Widget instead of the image charts? Or probably I have no idea what playlist thing from last.fm you are talking about
 
How do you guys get the playlist thing in your signature? I tried adding the code from Last FM but I keep getting an error message that the code is more than 1000 characters. It doesn't work?

Instead of clicking widgets click on chart images, then choose the type of chart that you want.