In the rich text editor:
@PossMoots
In a comment:
[PossMoots](https://chowlings.com/user/PossMoots)
For Names and Avatars:
In the rich text editor:
%PossMoots
In a comment:
[![PossMoots's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/PossMoots) [PossMoots](https://chowlings.com/user/PossMoots)