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