If you have an existing Student Account (username) with Prodigy you can link it to your ClassLink account!
After linking accounts, you can simply sign in with ClassLink going forward.
1. Navigate to Prodigy and select Log in.
2. Select the ClassLink button!
3. Follow the prompts to log in using your ClassLink credentials.
4. Click on "I have a Prodigy account", then enter your Prodigy Username and Password.
Please Note
Since you're linking a student account, you'll want to input a Prodigy Username and not an email. Using the email address will cause a conflict and not link properly in the system.
And you're done, you can now proceed with your account and log in with ClassLink!