In the rich text editor:
@XeroZero87
In a comment:
[XeroZero87](https://chowlings.com/user/XeroZero87)
For Names and Avatars:
In the rich text editor:
%XeroZero87
In a comment:
[![XeroZero87's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/XeroZero87) [XeroZero87](https://chowlings.com/user/XeroZero87)