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