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