1. Bungie made it very clear that changing tags was a one time option Maybe Bungie will allow a second chance to change your tag again sometime in the distant future. 2. The tag change was introduced when Cross play was introduced and players found themselves stuck with the wrong platform tag. The tag change was only intended so players could change their tag from one accounts name to another but as you did alot of players used the option if they didn't like their tag at the time. 3. This forum page and the help guides found with a basic search for them on Bungie.net or the Destiny app are the help sites. Most problems can be sorted by helpful community members, Mentors, Ninjas and if needed Bungie staff.