To set up the Use Tax calculations for Paradigm you must first set up the G/L accounts on which you will be paying Use Tax.
Go to your General Ledger>Chart of Accounts and click on the Select button on the account you want to edit.
Set the Report Use Tax flag
When you have all the accounts properly setup, you can run the "Use Tax" report from under the Accounts Payable heading in the Reports screen.
The "Use Tax Report" will show the totals for Vouchers or Bills where no sales tax has been paid and were applied to accounts that have been flagged as Use Tax