From the Product List Select your Registered Product
Select you Product by clicking in the checkbox beside the registration number and then click on "Renew Registration" button at the bottom of the page
After Click on "Renew Registration" you will move Invoice Details Page to Pay the Renewal invoice
After Paying you Renewal invoice the invoice status will change to Paid
From the Product Details Page you will be able to see the Invoice History will all invoices ( REGISTRATION & RENEWAL ) and the start date and End date for each invoice
