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