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