Yes, you can edit a recurring invoice.
You can go back to the beginning of the year, but I did not figure out a way to fully delete some of the old invoice numbers. They stated they were deleted, but the old invoice number still showed on my tax printouts. Zero balance or payments, though, so no biggie.
There may have been a way and I simply had not figured it out, yet.
I set up a John Doe account to play with at first.