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