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Hi, I don't really know why you wouldn't be able to resize your backgrounds, unless the layer is locked. You'll be able to check because on most programs there will be a little padlock (or something similar) in the layers pallet. In Photoshop you can double click the locked layer to rename it and unlock it.
You don't really need to save backgrounds as PNG files. These are best used for items where you need to retain transparency, like photo frames or word overlays. For ordinary backgrounds I would just save as a JPG file, but make sure to also save in your programs native file format if you want to go back and change them.
HTH
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