I'm trying to figure out how to only center the username in the poster's little information box on the left (forgot what it's called) and keep all the other information align to left. I would appreciate if you could help me center the rank as well?

Hello can i Please have the URL of your forum and the version ?

Add this to your CSS if your forum is phpBB3:

Code:

.post .postdetails.poster-profile, .post .name {
  display:block;
  text-align:center;
}


Sorry for not giving all the information, but thank you very, very much @Genesis!

This is solved!