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