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