if you don't have a zip program, use something like 7zip or other free zip tools to compress the files into a zip and in the advanced reply you will see where you can upload files. Or you can try to upload them without zipping but I don't know if you can upload php files since it might be a security thing. It would clutter the thread to post the entire contents of all 3 files in a post and will make it easier to open them in my text editor to make the corrections. But if posting the files in the thread is the only option do it in 3 separate posts, one for each file.