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