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