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