Just take a look at the instructions that are written in the txt files. Most of them say: Open file xxx.php - find code 'bla bla this' and replace it with 'bla bla that'. It's just a 'copy n' paste' work.
And always keep a copy of your original file in case you did something wrong.
For practise you should try it with some simple hacks first (which need only little modifications to the files).
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