I cannot change my address. I use to live in Costa Rica - changed my address to California but the address still includes a province Guanacaste and I cannot remove that. Also I try to add a US bank and get error messages
Paypal is country specific so if you move countries you have to open another paypal account in the country you reside in and add an address / phone number / bank accounts / cards from within that country.
You should really withdraw any funds / resolve issues / remove cards and bank accounts / cancel any subscriptions and close the old Paypal account before you move countries. If you don't then you may have problems doing so once you have moved and may need to contact customer services for help to resolve things.
You can however add a U.S bank account (not card) to 'most' other countries paypal accounts. This is because paypal is a U.S company and so allows this.
Advice is voluntary. Kudos / Solution appreciated.