How to hide Membership in a subdomain

I use Membership plugin on a multisite installation.All is good except the fact that I can't figure out how to give capabilities to the new users which just registered their subdomains.
It looks easy even with the User Role Editor in hand, but non of the settings are getting through.
For example I'd like all of them to be a Shop Manager - impossible.
I don't want them to use Membership and have it on their dashboard - I can't hide it even with a special plugin.
In Access level I added Pages as a positive option - now one can see them in the dashboard.
There somewhere is a little mistake and I can't figure out where it is.
Some suggestions, please?
Thank you :slight_smile: