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