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