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