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