Hey James and Pavol,
We are still working in progress for those documentation, because some of the module position we did renamed/removed because of the introduction of sidebar module in Easysocial 3.
For now, you can check which module position available in Easysocial page by append
?tp=1 from your page URL.
For example :
https://site.com/community/?tp=1
https://site.com/community/group/?tp=1
In order to show the module position on the page, ensure that you have enable this "Preview Module Position" from backend > extension > templates > click Option (screenshot :
http://take.ms/oF02r)