To use a forwarding address service in Poland, you will need to set up an account with a company that offers this service. You will then provide the company with your forwarding address, which can be a physical location or a P.O. Box.
When you receive mail or packages, they will be delivered to the address you have provided to the forwarding company. The company will then forward the mail or packages to you at your desired location. Some forwarding companies may also offer additional services, such as package consolidation, mail scanning, and international shipping.
It is important to note that forwarding address services may have fees associated with them, and these fees can vary depending on the company and the services you choose. It is a good idea to compare the fees and services of different forwarding companies before making a decision.