Hey :) Sometimes there is a time limit on changing stuff. If you go to your auction above your pics and title listing on the right you may see "edit" . If you click on that it will refresh your listing and you can change your shipping status. And for extra help, get as much of your info verified. You should get 100 bonus credits for each item you verify and you will get a lot more watchers and bidders because people will trust you. But besides all that hoopla, welcome to Listia and hope you have a great experience with it!
Click on your name (top right of page when you are logged in). A box will drop down that says my Listia. Click on that. When your page refreshes, on the left, click on your open auctions. Then when it refreshes your auctions should come up on the right. Click the pic of the auction you want to change. When it comes up you will see a button to click somewhere above your title and auction that will say Edit or update under auction tools. After you click that and your page refreshes again, go to the section that says delivery and cost. Click the arrow on cost and it will give you your options. You probably knew most of this but I figured I would walk you thru it . Hope this is helpful!