invalid zip code

[discover.my.world]

I am new to eBay.  I wanted to make shipping more reasonable, and just learned how to use the site preferences.  However...now my zip won't show up in  my listing, if I offer calculated shipping.

Before I changed my site preferences, it did...  But wanted to make it where the buyer did not pay full price for every item ordered.

I have read other posts, but for some reason...I am still not clear how to make this work. I don't mean to sound stupid, but I just can't figure out what to do.

I have done everything I know to do, and my (from) zip code will not show up.  What can I do?

[nobody*s_perfect]

There is no reason for your ZIP Code to show up in your listings.

I checked one of your listings, and combined shipping for the purchase of multiple items seems to be set up correctly.

Remember that a seller's view of their own listings is not the same as what buyers see.  To see what a buyer would see, you must log out of your account. 

[discover.my.world]

Somehow it just started working.  Maybe it needed some time to register, after I made the changes.  Thanks.