Give more information because there are many types of blogging software like Wordpress etc. and all have different ways. In general, you can just type the URL where you want in your post.
@ gtk, like the 2 statements right under your post (one in red and the other in blue) i.e: ''recover a hacked yahoo! email account' which when u click on will direct you to a site. how do you guys add that statement below your post......that is my question
its called Signature, learn to read the friggin FAQ/Rules page http://forums.digitalpoint.com/faq.php?faq=dp_faq#faq_signatures