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