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