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