Finale does not have a dialog box where you can type the number of measures per page.But you can set the number of measures per system. This is done with the Mass Mover Tool: Select the measures, and go to
Mass Mover menu > Fit Music...
And you can control the number of systems on each page. This is done with the Page Layout Tool. In the Edit System margins dialog box you can control the margins above and below each system. And you can control the distance between the system margins.
The Page Layout Tool also has some other interesting features in the Page Layout menu, e. g. "Space Systems Evenly..."
If you can't fit enough systems on a page, switch to the Resize Tool. Clicking the upper left corner of a page allows you to resize everything proportionally.
Peter