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