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Clear away any dust or dirt that’s gotten lodged in between the sole and the bottom of your shoe. After cleaning your shoe, let it dry completely. If there's old glue from the sole stuck to the bottom of your shoe, dip the rag in acetone nail polish remover and scrub at the glue until it comes off. Use a coarse sandpaper that’s between 40-60 grit. The scratches will give the shoe repair glue something to stick to. Apply the glue with a 1 centimetre (0.39 in) round paint brush. Paint the glue on with the brush so there’s an even layer over the whole top surface of the loose sole and the exposed bottom of your shoe.  You can find shoe repair glue online or at your local shoe store. Read the label on your shoe repair glue for specific application instructions. Some shoe repair glues require you to let them dry for 5-10 minutes after you apply them. Turn your shoe upside down and hit the hammer down onto the area of the sole you’re attaching. Hit the bottom of the sole several times with the hammer, moving the hammer slightly each time so you get the entire section of the sole you're reattaching. Use more than 1 clamp if you’re reattaching a large section of the sole. Attach the clamp to your shoe so one end is pressing down on the top of your shoe and the other end is pressing up on the bottom of the sole. Check to see if the sole is completely glued to the bottom of your shoe by gently pulling at the edges of the sole with your fingers. If the sole doesn't budge, your shoe is fixed and ready to wear.

Summary:
Wipe down the bottom of your shoe and the loose sole with a wet rag. Scratch the loose sole and the bottom of your shoe with sandpaper. Apply shoe repair glue to the loose sole and the exposed bottom of your shoe. Press the sole into the bottom of your shoe and hammer it into place. Use a clamp to hold the sole in place for 24 hours. Remove the clamp from your shoe after 24 hours.