In the rich text editor:
@hellvyx
In a comment:
[hellvyx](https://chowlings.com/user/hellvyx)
For Names and Avatars:
In the rich text editor:
%hellvyx
In a comment:
[![hellvyx's Avatar](https://chowlings.com/images/avatars/424.jpeg?v=1644063291)](https://chowlings.com/user/hellvyx) [hellvyx](https://chowlings.com/user/hellvyx)