BB code url is not allowed. (on signature)

Hi, tried to put a link to my website on my signature, but it keeps coming up with
BB code url is not allowed.’ When I make any attempt to do it. Is this because I am a relatevely new poster, or is it because this feature has been taken away? It would be nice if I could attach a link, other people seem to have links :pa:

Edit: I did try searching for this, but it came up with a server error rather than brining up any queries.