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