In the rich text editor:
@pandaepan
In a comment:
[pandaepan](https://chowlings.com/user/pandaepan)
For Names and Avatars:
In the rich text editor:
%pandaepan
In a comment:
[](https://chowlings.com/user/pandaepan) [pandaepan](https://chowlings.com/user/pandaepan)