Depending on your browser (Firefox doesn't, Google does) you get the print page. Firefox downloads the label to your default download directory.

Check your downloads, it will be there.

Otherwise you can cancel after 5 days and wait 2 months for eBay to refund.

If you got the print page, at that point you have already committed to this postage. Why didn't you print the label? You must have sold the item to get the postage label option.

Did you offer 500g eBay satchels but don't have any?  That is the only option that costs $7.15. If you plan on using standard 500g satchels, they are significantly more expensive to post than $7.15.

More info needed. And you should probably have a look at the site map. And ask a lot of questions.