In the rich text editor:
@sonefire
In a comment:
[sonefire](https://chowlings.com/user/sonefire)
For Names and Avatars:
In the rich text editor:
%sonefire
In a comment:
[![sonefire's Avatar](https://chowlings.com/images/avatars/13.png?v=1647826885)](https://chowlings.com/user/sonefire) [sonefire](https://chowlings.com/user/sonefire)