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