Greetings Julie Wo,
From what I understand, you would like to edit the personal information associated with an existing iCloud account. If you would rather avoid creating a new account, you can edit some information. First you'll have to reset those security questions. The following article will help you do so:
If you forgot the answers to your Apple ID security questions - Apple Support
If you couldn't send a reset email, don't have a rescue email address, or can't access email at your rescue email address, contact Apple Support. Apple may ask you to generate a temporary support PIN to verify your identity. After you reset your security questions, you might want to update your rescue email address.
If you have trouble remembering your security questions, you might want to set up two-step verification. With two-step verification, you don't need security questions to secure your account or verify your identity.
If you answer your security questions incorrectly too many times in a row, you'll be temporarily unable to access your account, but you can try to reset your questions after the waiting period ends.
Thank you for contributing to Apple Support Communities.
Best,
Bobby_D