In the rich text editor:
@CalamityOwl
In a comment:
[CalamityOwl](https://www.whistlercrest.com/user/CalamityOwl)
For Names and Avatars:
In the rich text editor:
%CalamityOwl
In a comment:
[](https://www.whistlercrest.com/user/CalamityOwl) [CalamityOwl](https://www.whistlercrest.com/user/CalamityOwl)