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