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