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