In the rich text editor:
@Davidwfo
In a comment:
[Davidwfo](https://chowlings.com/user/Davidwfo)
For Names and Avatars:
In the rich text editor:
%Davidwfo
In a comment:
[![Davidwfo's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Davidwfo) [Davidwfo](https://chowlings.com/user/Davidwfo)