What is the easiest way to make a private page

Hi !

I'm looking for a little help.
I use Membership with a free registration.
All the members have the Subscription "Membres" which gave them the Access Level "Membre".
The visitors do not have the right to access some pages.

I'm not sure I understand how access levels works.

What is the easiest way to limit a page for a several users ?
If i create a positive rules, they will have access only to this page.

Thanks !