EasySocial mobile app - any instructions?

Hello!

Thank you very much for this app, but...

I installed all plugins and com from https://techjoomla.com/downloads/1-6/ to my website
I installed mobile app EasySocial from GooglePlay to my smartphone (GalaxyNote4)
and I can't connect to my site.

I have questions:
which version of EasySocial I need? (now 1.3.7)
if 1.3.7 ver is OK, how I need set my com_api ? or some other components?

I found page https://techjoomla.com/mobile-apps/easysocial-app.html and there are no any installing instructions...
so I found https://techjoomla.com/mobile-apps/junite.html and don't see any instructions, just "Get it for free"/ Ok, I got -) and ?

I logged in http://demos.techjoomla.com/easysocial/administrator/index.php?option=com_plugins&view=plugins
and see my site has plugin API-users and also I has api_com
but this site http://demos.techjoomla.com/easysocial/administrator/index.php hasn't com_api

here https://techjoomla.com/extension-documentation/all/ no any docs for EasySocial app

Also when I try toconnect to my site with mobile app I see - API plugin not found
But my site admin panel plugins - http://gyazo.com/860055265bd584cfba2ea2f695ebe68f

also I see error - "undefined"

Activity stream at my site has url http://www.site/home/community.html
At mobile app I insert this url into area "Site url" and my username and my password.

thanks