Customs forms (need help)

https://preview.redd.it/el74sl3tq5pe1.png?width=1318&format=png&auto=webp&s=1f6f821ce69dd84cea1e698839d713d04c63638c

Got some very expensive guitars from Poland being held up at Customs and it's making me fill out a form that might as well be written in hieroglyphics with how little I understand it. Has never happened before. Anyone know what I am supposed to be doing? Guitar company has never had this issue before so they can't help me. It's asking me to fill out a "IMPORT CUSTOMS POWER OF ATTORNEY" form and I just have no idea what I am supposed to be filling out or 'box checking'.

Edit - link to form https://online.flippingbook.com/view/810442206/

What the heck do I fill out to make this go smoothly?