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