If you wish to save the progress in the app, you should link your account to Facebook/Apple/Gmail. To locate the log in options, do the following:
1. Open the app and pass the onboarding process.
2. Go to the "Profile" section located at the bottom right corner.
3. Press on the "Settings" icon located in the top right corner.
4. When you are in, tap the "Linked accounts" button and you will be able to log in using one of three options:
Select the most convenient option for you and press the "Link" button next to it. When you are all set, you will see "✓" in a green color close to the platform chosen.