Freelance Project

I’m having Juga component for Joomla installed, components and modules added, groups created, user assigned, site items assigned, it works ok for restricted access to some pages.
I need to setup front end and back end restricted access, when user login on front end to be only able to edit specified items, and also if login on back end to be able to edit only assigned items to him/group.
They claim at Juga support it’s ok and possible to setup, just I didn’t figure out the way.
This should be just simple suggestion request but I can provide my temp joomla install to setup component. I can grant you admin access to setup all that’s needed.