If you use Linux its no problem, however under Windows I could never quite figure out how to use them properly. What I do is open the .diff with wordpad and manually make the changes. Basically, you'll see lines of code that should already be there on either side of his changes. His changes will have a + or - in front of it. Just copy and paste any line with +, and insert them inbetween the proper lines of code and remember to remove the +s. Any lines of code with - before it means those lines get removed... Simple as that.
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