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