In the rich text editor:
@slipper016
In a comment:
[slipper016](https://chowlings.com/user/slipper016)
For Names and Avatars:
In the rich text editor:
%slipper016
In a comment:
[![slipper016's Avatar](https://chowlings.com/images/avatars/2188.png?v=1681084893)](https://chowlings.com/user/slipper016) [slipper016](https://chowlings.com/user/slipper016)