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