How do I make the underline and little links on my replies?

Hi I am new here, so I was wondering how to get that underline after writing my post and how to add those little links at the bottom.

All I am ending up with is this

________________________________________________________________________________________________________________________________________

Writer https://onlinewebnovel.com




If the signature is like the

Mist of Kel Doran Online Novel and your link underneath, then thats exactly what I wanted. Thank you very much!