my Signature,why look so?

[sam999]

now ,my signature is my ulr , it is not same yours . why ?
I want my signature is my web site name ,but it can link my web .
how  should  i do for it ?

[Sevam]

sam999, [url=http://www.burnscalories.com/]burn calories[/url]

and one more thing from forum rules:

IV. Linking and Signatures

      1. If you have less than 10 posts, your links will be shown as plain text.
      2. Having 10-20 posts will produce "nofollow" links.
      3. After 20 posts, your links will get "dofollow" attribute.

[sam999]

thanks

[maximus4992]

thanks

What is "dofollow" and "nofollow" bro?