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