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