Hi Octiva, As stated by Wayoutwest, you can change the category thought ebay revise. And just to let you know, you cannot change auction style listing to a "buy it now" listing, you can only add a "BIN", and also same for "BIN" cannot be changed to a auction style listing.(just in case you were not aware of this).Hope this helps you!
On your other issue about the scrolling window, this is a bug in the system, as it happens all the time, changing the price, does not seem to update on the window, almost never for me, same with closed auctions, will show up in the window. You can file a support ticket on the price change, and for closed auctions, you can edit it not to show in your window. These are very common bugs here, but the great staff here are working on them, and are very helpful. You can't beat this free service, even with the bugs now and then. Welcome!!