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