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