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