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