Only 2 pages – Pro Version for more?

NOTHING in the MuseScore Studio application requires any kind of membership, signup, or payment. The only “upgrade” available is getting the newest version of the application … for free.

To make your score continue beyond page n, simply continue entering notes. When they fill page n, they will start entering on page n+1. Alternatively, you can enter Page Breaks from the Layout panel or palette (depending on which version you have). Nothing stops you from going beyond 2 pages (or any other number)