In the rich text editor:
@H0piv3
In a comment:
[H0piv3](https://chowlings.com/user/H0piv3)
For Names and Avatars:
In the rich text editor:
%H0piv3
In a comment:
[![H0piv3's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/H0piv3) [H0piv3](https://chowlings.com/user/H0piv3)