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