Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
Unfortunately, it is not possible to register the kindle without access to a wifi network.
While you can ultimately download books to the kindle via a usb cable from your computer later on, the wifi network is required for the initial setup/registration step.
If you don't have a home wifi network, you can take it to a place with a public network such as a library, starbucks, etc and do so there.
If you have wifi at home but don't know your password, I can help you with that.