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