In the rich text editor:
@skeleman
In a comment:
[skeleman](https://chowlings.com/user/skeleman)
For Names and Avatars:
In the rich text editor:
%skeleman
In a comment:
[![skeleman's Avatar](https://chowlings.com/images/avatars/443.jpg?v=1644063293)](https://chowlings.com/user/skeleman) [skeleman](https://chowlings.com/user/skeleman)