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