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