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