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