25 Jun 2006 at 05:55 - 2
"Titles" advance with the number of posts you contribute to the forums. (Or in some cases, titles are altered by the moderators to denote a special title, such as Forum Moderator or Price Checker help, or Anet representatives, for example.)
As for changing the guild information, or any other information in that case, click on "USER CP" the you will find a menu allowing you to "Edit Profile". Just delete and retype any information that needs to be changed.