Image editing

Can anyone please help me and edit this picture? http://i.imgur.com/XcvYLFX.png The only thing I want is to cover the white part of it with same table cloth pattern as seen there. Thank you!

I've used a few pdf editors, form makers, and the like that allow you to select an element even after it's been deselected and other changes have been made. So, for example, I can add a text box, draw a line to it, then edit the text in the text box or move it around without affecting the rest...