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