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