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