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