Is it a heat transfer patch or one that you sew on? If it's a heat transfer one take it to a graphics place, or shirt printer place, if it's a sew on one get your needle and thread or take it to a seamstress
If it is a gym patch, then surely a lot of people in your gym has that. It's best to ask them which is the best way to put them on your gi, some might even have experience doing it one way or other, fail and succeed.
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