Hello
I can't understand at all how the jomsocial works with jreviews. Can you please tell what i have to do??

Hello Thodoris

Joomla can load only one component per page load. We can tell you how JomSocial works, but we can not possibly know how every third-party component work.
That being said, if you explain your issues a bit further, we might be able to help you, but with vague description like this, theres not much we can do.

Can you please advise what exactly is making confusion for you?

First of all when i try to register after the first page (name, email username, paswword) i get an error page.
I dont' know who to enable the listings from jreview to my profil.

Hello Thodoris

please post your issues in official support forums.
Pre-sales section is not the place where you should ask for support.

Thanks