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