You can change the address by going to Payments -- > Payee profile by clicking the Settings button at the top.
You will see an edit button to edit your address. After editing your address, save it. Then go to Account information under settings. There you will see an option to verify your address, which will take you to the PIN request page.
After changing the address, it will take some time for the new address to reflect in the PIN request page. Do not worry and wait for sometime. Then request for a new PIN.
It will take 2-4 weeks for the PIN to reach you based on your location.
You can request for a new PIN for three times, each new request after 4 weeks past the previous request. After 3 times, you will not be able to request any more PIN and will need to upload a Gov. id proof for your new address, which will be enough for the address verification.
But if you receive any of the 3 PINs, you can use any of them as they will all be same.