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