In the rich text editor:
@SinisterPastel
In a comment:
[SinisterPastel](https://chowlings.com/user/SinisterPastel)
For Names and Avatars:
In the rich text editor:
%SinisterPastel
In a comment:
[![SinisterPastel's Avatar](https://chowlings.com/images/avatars/2058.png?v=1677851926)](https://chowlings.com/user/SinisterPastel) [SinisterPastel](https://chowlings.com/user/SinisterPastel)