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