There is no button, you can contact customer services to appeal as long as you have new information that was not available to them when they made their initial decision.
Paypal phones are mostly non operational since covid but sometimes you get lucky. If there is one available it will show when you click help / contact bottom left of Paypal pages for options available in your country. Live chat is randomly available. You can send them a message. Or have you considered contacting Customer Service via Facebook or Twitter? You can send them a personal message from their facebook or twitter pages. It's: https://www.facebook.com/PayPal and @AskPayPal for Twitter.
Advice is voluntary. Kudos / Solution appreciated.