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