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