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