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