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