In the rich text editor:
@LuigiWizard99
In a comment:
[LuigiWizard99](https://www.worldofgaia.org/user/LuigiWizard99)
For Names and Avatars:
In the rich text editor:
%LuigiWizard99
In a comment:
[](https://www.worldofgaia.org/user/LuigiWizard99) [LuigiWizard99](https://www.worldofgaia.org/user/LuigiWizard99)