Greetings mabjr89,
The steps you follow to edit the AutoFill information will depend on what device you use. That being said, there are a few pages offered by Apple that can help:
If you use a Mac, you can follow the steps offered on this page to access and edit your AutoFill Settings on your Mac: Change AutoFill settings in Safari on Mac.
If you use an iPhone, you can look over and follow the guidance offered here: Automatically fill in your information in Safari on iPhone.
For an iPad, the steps are similar to an iPhone, but just in case, you can view them here: Automatically fill in forms in Safari on iPad.
If you need further support after following the steps offered here on the page that supports your device type, you'll want to contact Apple directly. You can reach out to them by clicking here: Contact Apple Support or over the phone by calling the number that is most local to your region: Contact Apple for support and service.
Best wishes!