I dont want to appear dumb but where is the OPtional image url box? Is that the one on the first page where I upload a file.

Where you sent me to do the cut and paste changes each time I do another upload, does the one before that go away? I know I missing something very easy here. I know how the one worked here on the BB. You had an option to override an image if you had one out there. I dont see that here.