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