Disregard. Thank you very much, it was quite confusing but I understand with your help!
Did this work for you? Because I am getting the same error and nothing will fix it...I cant change my old address to Inactive either...
Yea it's pretty convoluted. So if you hit the "Edit my phone, other email addresses, current address" button it'll pop up that window where you seemingly can't change anything.
There is an "Address type" header, and an "Address History" subheader. Use the arrows on the right side of the "Address type" header to select "HOME" address
Then, under the "Address History" the frustrating part is that you cannot edit the address, correct? The solution here is instead, that you need to add a new address. So you will hit the + sign, NOT under the "Address type" header, but under the "Address history" subheader. once you hit that + it'll basically create a copy page of your current address, however you WILL be able to edit this address.
Once you edit that address and finish up, there should be a box to check or something to make it your active address.
I guess their reasoning behind making it this way is so that they always have a complete history of where you have lived, you can never edit or fully delete addresses from your NSIPS.
Hope this helped.