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