To renew on IMDbPro, you'll need to link your Amazon.com account; please see Can I join IMDbPro without linking an Amazon Account for further details. To begin the renewal process, please go to the login page and select "Log in" and then select "Log in with Amazon" and enter the login information for your Amazon account.
Once you've linked the Amazon account, you can log in with the details for the IMDb account you wish to connect. Then click "Renew Membership", select the membership plan and select "Continue". You'll be able to enter your credit or debit card you wish to be charged on and once your card is successfully charged, you'll have access to your IMDbPro membership.
If you have a discount, please renew on promotional code page.