Originally Posted by jkphotoguy
but i have seen people around the forums that have information about their computer that comes up everything they post something i was wondering how to do that..
Those are called signatures. You're not allowed one until you've had 40-100 posts, which are only text sigs. 100+ posts allow graphic and text sigs.
You can read more about that in our general rules thread:
Computer Forums - Announcements in Forum : Site Feedback & Suggestions
And be sure to read the other rules as well.
You can check if someone has replied to one of your posts by going to your User CP. And while in the User CP, you can also edit options on the left, and choose whether or not you'd like to be notified by email, etc.
carnageX beat me to it.