Testing XML X and Y Coordinates?

Any map makers able to help me out with this process?
1. I put the Photobucket image location in the Map URL text box.
2. Select the appropriate size.
3. Select the xml file from my computer in the Map XML file box.
4. Click Test Coordinates.
5. Nothing happens! Page reloads, but there's nothing new there.
1. I put the Photobucket image location in the Map URL text box.
2. Select the appropriate size.
3. Select the xml file from my computer in the Map XML file box.
4. Click Test Coordinates.
5. Nothing happens! Page reloads, but there's nothing new there.