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