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