Hey, I need some help

First, I want to know how i can get members on my site like how to be able to register people and stuff

Second, I want to know how to make a comment form where the user types in stuff and then when they enter it it appears under the entry i made like xanga or myspace

please do not post the same question in different forums.
original post here...
http://www.lissaexplains.com/forum/showthread.php?t=78376