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