If you don't currently have a Deferred Revenue account configured in QuickBooks you will need to create one before using ProRata.

Go to Transactions > Chart of Accounts then click New. Deferred Revenue should be a Liability account. Choose which type of liability account you would like it classified as then rename it to Deferred Revenue.
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You will then need to change your product(s) income accounts to deferred revenue for any product that needs to be deferred.
In QuickBooks, go to Gear > Lists > Products and services. You will then need to edit each applicable product's income account to be Deferred Revenue.
You can also optionally choose to apply this change to historical transactions. If you choose to do this be sure to import all of your historical transactions into ProRata.

Making this change will ensure that all the revenue is deferred up front for any of these products. ProRata will then decrease their deferred revenue and increase their income accounts each month.

If you need to create journal entries to manually adjust your revenue and deferred revenue accounts you can follow these instructions.