Add the item, choose standard shipping unless you specifically need faster, and keep escrow standard. On a first order with any vendor, keep the quantity small and the product cheap, because a first order is really a test of whether the vendor does what they say.
Do not select any option that releases funds before delivery. The whole point of escrow is that your money is protected until the package is in your hands.
Before you submit, encrypt your shipping details, which the next sub-step covers.