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