In the rich text editor:
@harpseal
In a comment:
[harpseal](https://chowlings.com/user/harpseal)
For Names and Avatars:
In the rich text editor:
%harpseal
In a comment:
[![harpseal's Avatar](https://chowlings.com/images/avatars/2777.png?v=1696382858)](https://chowlings.com/user/harpseal) [harpseal](https://chowlings.com/user/harpseal)