In the rich text editor:
@Tuxedocatstuff
In a comment:
[Tuxedocatstuff](https://painted-relics.com/user/Tuxedocatstuff)
For Names and Avatars:
In the rich text editor:
%Tuxedocatstuff
In a comment:
[](https://painted-relics.com/user/Tuxedocatstuff) [Tuxedocatstuff](https://painted-relics.com/user/Tuxedocatstuff)