eBay

Ebay informed me (seller) that I can make an offer to some of my listings. How do I do this?

I emailed the buyer on 01.11.2022. The 9 digit zip code from the buyer showed 'not valid', however the first 5 digits were valid. I asked her in the email if I may use just the first 5 digits AND also if I could ship her package UPS, for a shorter de...