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