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