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