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