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