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