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