It’s a simple diff file. To use it, either save the pastebin content (e.g. feedburner.patch) in folder where feedBurner-feedSmith-extend.php resides and use “patch” to apply it :
patch -p0 < feedburner.patch
Or you could replace / remove the lines in feedBurner-feedSmith-extend.php with a text editor. A minus sign at the beginning means the line was deleted and a plus sign that a line was added. For instance, the first 2 entries are used to replace 2 lines and the remaining entries remove superfluous lines.
I hope it’s understandable 🙂