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