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