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