The user info is for how many posts/threads you have. I think junior is after newbe. There is also senior , posting freek and others . These are probably not in the right order tho. Someone should reply and explain this better to you.
If you want your city/state by your username you go to User CP at the top of the page and go to profile and it will ask you where you live. You can also put your own signature/list of your pets under your post. I hope this helps!!!
As Jaizei has said, you are going to be a Junior Member until you have made 49 posts, then it will automatically change and will show that you are a member.
You can add your city and state by going to your User CP page. On the left side click on "edit profile." When the new window comes up, look for "Location" down towards the middle of the page, and type in your city and state. Then go down to the bottom of the page and click "update profile."