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