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