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