Hi @fourbest2cgw . If you need to cancel the first label due to inaccurate weight and dimensions, you can do that pretty easily. Once that's done, you can use the action to purchase another label and this time use the edit option to enter correct weight and dimensions before buying the label.
If you're on the website you may want to click the link on the top right of the label page that says "show advanced shipping options" as that will make it so much easier to edit weight and dimensions, plus other factors, without everything hidden as it is on the simplified label page.
To void a shipping label purchased through eBay, go to this page, find the order and select Cancel from the Actions drop-down. The cancel option is available for 28 days.
It takes between 2-4 weeks to receive a refund on an unused, voided label as the carrier wants to make sure the label isn't used. You'll see the refund on your original source of payment (eBay funds, bank, credit card, etc) and the funds will appear in your account without an email notification.
If you have any additional questions come back and ask.
