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