To change the email on your account when you signed in with Google, you'll first need to unlink your Google account.
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You can unlink your Google account from Bubble by going to your Google settings, clicking “My Account”, selecting the Security menu, locating the “Third-party apps with account access” section, and removing the authorization from Bubble.io. From there, you should go to bubble.io, click the “Sign in” button, and follow the password reset flow to create a new password for your account.
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Once you've unlinked your Google account and created a password for your account, you can change your email address by going to your Account Details page and clicking "Change email address".