I have been reading that only one Account Can be played per device. I am concerned That the previous owner played boom beach because he said that it runs on the iPad which means that he had tested out, making an account in the process.how can I play on the iPad? Hentai just reset it to factory settings?

Can't i.. Not hentai

Nope, ever since the update it is possible to use your current account on different devices. All you need to do is go to the settings tab in the side on your old device. Find Link a Device and click "Old Device". Then go to your new device click the same setting button but this time you will click "New Device"In your old account it will show a code you type it in the new device and it will link