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