Can't check into flight using website - Use the app

If you're running into issues checking in through the website, just download the app, continue as guest, add the trip using confirmation number and last name, then check in through the mobile app.

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I tried to check into my flight but the website won't let me scroll down to the button that lets you check in. Very silly. I tried many devices and browsers, it's all the same. I called customer support and they were very unhelpful. No check-in via phone. They say I should arrive 3 hours early! Just use the app. It takes 10 minutes but it works.