THats what I use for my shipping labels and to calculate the price of the packages. I put in the zip code and the weight, if I'm using priority mail, the del. conf. is free and if I'm using parcel post the del. conf. is 13 cents. I pay for postage at the post office. And even if your off with the weight, thats ok, because when you bring it to the post office they scan everything and weigh it. So no matter what you put down for weight, they go by what their scale says. And, with the shipping assistant, the buyer gets the confirmation number by email, which saves you time. You don't have to email them anything ,the postal site does all that for you.
All I do when I use shipping assistant is type in the buyers name,address,city/state and zip. The weight of the package and I click on del.conf. by email. Then a little box pops up and you type in your name and email address, along with there email address.After you click submit(on the bottom of the page) a few seconds later a del.conf. number comes up. Then you click "display label". Once the label comes on your screen, just click "print label". The label prints, and then you cut off the receipt and attach the label to the package and bring the receipt to the post office with you. I give them the receipt to stamp with todays date and keep that part for my records. They weigh and scan the package, you pay, they give you a paid receipt. And then your done. I'm pretty sure this is all of it. I have a few auctiions ending on sunday, I'll be using shipping assistant and if I missed anything I'll post for you. But its verrryyy easy. If I can do it, any one can....Hope this helps...Oh, also, on that page on the top, these a spot that says "domestic rates", if you click on that, a page comes up and there you can find out how much a package will cost to send. You type in the your zip code, the buyers zip code, the weight and how your mailing it, (priority/parcel post). You click submit and you will get how much it costs to send. After I get the notice from ebay with the buyers zip code, I go to that site and get the cost for shipping to them.
Denise