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