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