The settings for normal listings are in your My eBay preferences section, under selling preferences >> payments from buyers.
I'm not sure if you have to set them up differently for stores, sorry.
One thing though, I did see that you have a section in your (currently empty) store stating payment is by Bank Deposit only. This is not allowed. You must offer a safe payment method, so you need to remove this wording.
You've also mentioned auctions. Do you plan to run auctions as well as the fixed price store listings? If not you may want to change the text to read "within 48 hrs of the listing ending" instead of "auction ending".
