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