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