If you do not have access to the original photo, here is how you can move a photo to a new location.
Open the photo
Right-click and "Save Image As" -- to your hard drive
If you are on an iPad Here is how to save the photo by tap and holding on the image to open up a dialog. Then click on "Save Image" and it will go into your camera roll/Photos. From there you can add it back into Blazemark.
Go to where you want to add the photo and upload as usual.