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