This may be in your initial email after you purchased your Domain name. This is who you pay your annual fee for renewing your domain name/URL. (*We recommend you set up your renewals at least every 3 years. Good for Google respect. )
You can get this information from your current hosting company.
How do you log into the back office of your current website. Place the link to login here.
(You can get this from your current hosting provider)
Provide information for your current website hosting company.
Enter the correct verification code.