Need 2 different IP addresses for each FB account. How do I do this on same PC?

Being harrassed on FB but even if I block the person, they open new accounts so I made a new fb account but that person is still harrassing me. So I have 2 fb accounts and want IP address that is different for both so they don’t know it is me. I even changed my name but they found me again yesterday on the new account and they did it with the IP address. So how do I get 2 differnet IP addresses for 2 different fb accounts?