The "Front" is indeed at position 1. That will be at the 4000 pixel mark on the panorama.
If you want to change the viewpoint there's two options:
- If it's just the spherical projection as a flat image, use the "Offset" filter in Adobe Photoshop
- If it's an interactive 360 image, use the viewer to set the viewpoint. e.g. with KRPano you can easily adjust the viewpoint.