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