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