Depending on what kernel you have you may not even need the Injection driver patch. If you're using kernels 2.6.24 or 2.6.25 then you need the patch. If you have a kernel later than the mentioned, you don't need to have the injection patch. If you're not sure what kernel you have, go into the Terminal and type:
Now if you're wondering on how to apply the patch once you have downloaded the injection patch, you can just simply run:
I'm just guessing you're using the "2.6.24" kernel. Then that should apply the patch and you should be ready to go. Once you applied the patch you should probably see if you're running the new patched module, so you can run in a Terminal:
patch -p1 -i b43-injection-<2.6.24>.patch
That will tell you some details about the new module and what not. In all honesty though, I don't even think this patch applies to you, because you probably have a newer kernel.