If your school enabled single sign-on with G-Suite, and you created a new account using a Google ID, and then realize you already have an existing account (with a Personal ID) to which you want to link the Google ID, you can unlink the new account from the Google ID and start over.
For example, you might have linked to the wrong Personal ID/password (sometimes students have made multiple accounts), or you may have created a new account when you meant to link to an existing one.
To correct this, in the new account with the Google ID, click My account in in the upper right on the NoodleTools screen and select My profile to view the user profile. At the bottom of the next screen, click the link “Click here if you would like to connect your Google Apps login to a different NoodleTools account.”
Clicking this link will sign you out and disconnect your Google ID from the account. The next time you click on the NoodleTools app or enter your Google ID at the sign in page under "Access via G-Suite," you will see the intermediate screen again, allowing you to link to an existing account and enter the Personal ID and password for that account.