Every Kindle has an email address. You can find yours by going to "Manage Your Content and Devices" on Amazon.com and click on Settings. Then, look for "Send-to-Kindle Email Settings." Your email address will be there. It will be something like "your.name@kindle.com".
To avoid costing you money, we only send the cookbooks to your @kindle.com address. Your device will also need to be connected to wi-fi for the cookbook to sync.