You can make changes to your Paperform plan, such as upgrades and downgrades or billing intervals, through your Account Settings. Here's how:
Go to your Account Settings via the avatar located at the top right of your Paperform Dashboard.
Select the "Billing" tab to the screen's left.
If you have no subscription, just fill the form out to sign up for a paid plan. If you are looking to change your plan or the billing interval, just change the details in the "Change plan" form and click "Change Plan" to confirm.
Note that changes in plan type may impact your form's functionality.