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