You have peeled the image off the backing of your instant film. Don’t throw away the negative! You can reveal it easily using cold water and some bleach.
Step 1: take your negative (everything that is left of the film once you’ve peeled away the instant print) and go to the sink.
Step2: Under cold water, gently rub off the chemical grey goo of the emulsion side of the negative.
Step3: Still under running water, take a small paintbrush, dip it in some household bleach and gently paint over the black underside of the negative. It will take some time, but the bleach will take away the coating (called the anti-halation layer). Try not to get any bleach reach the other side of the negative
Step4: let it dry thoroughly and scan.
You can use gloves to handle the gooey stuff. If, like me, you don’t like gloves, it is fine as long as you wash your hands properly afterwards.