eBay

Just sold a bulky item to be shipped in a 6 lb 10 x 10 x 10 box but buyer select priority flat rate shipping, how is that possible, is ebay shipping unable to detect the difference?

I sent 2 packages to wrong buyers, I've messaged both and they are willing to ship the packages directly to each other if I send prepaid labels. I have the labels ready to go but how do I get the labels to them electronically?

I sell Under two different usernames is there a way to use one app and switch accounts

Sold an item to someone not far from me, contacted buyer and arranged local pickup after he'd paid. How do I mark item delivered?

I have been on ebay for years, just recently added a separate username, can I have one log in for both usernames and is there a way to share feedback ratings from my long standing username with my newest username?Thanks