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I'll guide you in changing an email of a Master Admin, proshopautomotiv.
First, you need to log in as the Master Admin, then click the Gear icon. Under Profile, you want to click on Intuit Account and edit your Email address.
You can also check out this article to see the other options in changing your email address: Change the email address you use to sign in.
Please don't hesitate to reach back out if you need further assistance.