The metal thingy is used to roughen up the tube, where the patch will go, so the glue will stick. The glue may have instructions on it, but place glue onto the patch and the tube and let it dry for a few minutes, then place patch over hole.
when refitting the tube, sprinkle some powder on it around the patch and inside the tyre, make sure you have removed whatever caused the initial puncture. Try to refit the tyre without using any levers, so you dont pinch the tube again
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