Hello LarryKat and welcome to the ArtRage forums
You can use the Eraser to remove any background areas you want removing or the Selection tool and then delete the selected areas.
But from your post I’m not sure from if this is what you are asking
Generally it is often better to do any painting to an imported image on layers above the actual image for greater flexibility but the specifics of any given job may dictate otherwise.
If you are referring to AR’s built-in “Canvas”, and you need a transparent background, then the visible canvas can be turned Off by opening the Canvas Settings panel and sliding Opacity down to 0%.
If none of the above then if you could perhaps expand a bit on what you are doing and the type of image file you are working on, jpeg, png etc… that could help.
Or is it a PSD file already containing layers? If the latter then there maybe more options available.
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