Hi. Welcome to TCS. You'll be a "kitten" until you have 20 posts and 5 days of membership, then you'll be a "young cat".
Here are the rest of the titles and when you get them.
Newbie: 0 posts upon joining
Kitten: 5 posts and 1 day of membership
Young Cat: 20 posts and 5 days of membership
Adult Cat: 100 posts and 10 days of membership
Alpha cat: 300 posts and 40 days of membership
Super Cat: 700 posts and 90 days of membership
Top Cat: 1200 posts and 120 days of membership