Sin: Final Battle Help

[Tavrobel]

Ok, I'm playing the original North American version, NTSC.

Fixed.

Now where do I go? I've read about "Inside Sin" and all this,
but I'm at a loss as for where to go to do this. There are no new destinations for the ship.

You go back to Sin (on the same name as previously mentioned), and you head in the direction of the Red Arrow.

If you have not yet defeated Sin's Core, then do so. If you have not beaten Overdrive Sin (Sin appears with an Overdrive Bar below him, like an enemy Aeon), then you must do so. After that, a few cutscenes will land you outside of Inside Sin.