You need a certain amount of posts. If you post enough, you will become a senior. Then post more, you will become yber etc. I don't know the exact amount of posts, but there isn't anything else you can do to get new titles.
Also this is not a tutorial. Questions go under "support".
You'll become Senior Member after 500 posts, and you'll become ub3r after 1500 posts. Don't spam to get the titles though, they aren't worth it. Honestly, it's just a word or two below your username.