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