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