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