You can add additional page breaks:
-in Design Tab select a field on the form,
-then select app menu Insert / New Page, a new page break will be added below the selected field.
There are two places to add page breaks:
If you are creating a FormsCentral web form then you should add the page breaks in Web View (select View in app menu and make sure that Web View is selected)
If you are creating a FormsCentral PDF form, then you should add the page breaks in Page View (select View in app menu and make sure that Page View is selected)
On the corresponding view, just select Insert / New Page.
Hope this helps,