In the rich text editor:
@Dearlydoo
In a comment:
[Dearlydoo](https://chowlings.com/user/Dearlydoo)
For Names and Avatars:
In the rich text editor:
%Dearlydoo
In a comment:
[![Dearlydoo's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Dearlydoo) [Dearlydoo](https://chowlings.com/user/Dearlydoo)