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