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