I want to change my username from Tyrange_D to YG_113 due to privacy reasons. How do I do that?
Travis will need to make the username change for you, if you want the name changed overall on your TMDb account.
You can meanwhile, as a strictly cosmetic adjustment, change your display name (the name that appears when you post) by doing the following steps:
Click on your avatar.
Select Edit Profile from the drop-down list that'll appear.
On the page that'll open, look for the line (it's directly below the row of circles that appear in several different colours) that says "Name". Type YG_113 there.
Scroll down that page and click on Save.