I broke my iphone 4S, got another one. How I activate my iPhone 4S?

So, a few weeks ago I broke my iPhone 4S that I got from Verizon. I bought another one on eBay, I want to activate it. However, I don't feel like going to my local retail Verizon store. They're not very nice there. Anyway, I logged in into my account, which shows two numbers, mine and my Granny's. I click on the link "activate or switch devices." I go there, how do I activate my new iPhone now without having to go to my local retail Verizon store? There's also another option for adding a device?

Any help will be absolutely appreciated.

Via itunes account download on to desktop conncet to itunes. Done

You can connect your new phone to itunes and insert your old SIM card into your new phone.

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