Total Newbie question about XML file and install of a hack

[Sangrun]

I just changed the code in my class_core.php file to add the real IP hack from one of the wonderful people here.

His last instruction line says:

Step 5.

Upload the hack as a product using the supplied XML file - make sure that 'Allow Overwrite' is set to yes before importing.

Here is where I make myself look like a newb that I am. I am an IT person, but not good at internet coding of any kind.

Use the XML file supplied to upload? Why? What? I changed the code on the main file and why do I need to use the XML file?

Overwrite? What needs to be switched and where? I looked all over until I decided to upload the new PHP file and then my FTP manager asked if I wanted to overwrite the file on the server and I said yes. Is that what the instruction meant? Or is there a place I have to go and select to overwrite my PHP files.

Using the XML file do I have to upload that to the server?

I did make a back up before I did any of this just so people know I'm not a complet idiot.

Thanks, I am a confuse idiot, but very willing to learn. :banana: