In the rich text editor:
@glassbots
In a comment:
[glassbots](https://chowlings.com/user/glassbots)
For Names and Avatars:
In the rich text editor:
%glassbots
In a comment:
[![glassbots's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/glassbots) [glassbots](https://chowlings.com/user/glassbots)