The manual has no appendix or FAQ. But I am impressed that there IS a manual and it has more than 20 pages.
To answer the original question, you can save by using the ALT-G keys and then picking a slot to save. You will have to reload.
I have pored over the manual for hours and still have gotten next to no where. I managed to land on Earth, but that is it. I have no idea why my weapons no longer work, or what STS means and why it relentlessly flashes on my HUD. I have no clue why I canÔÇÖt find a target, any target, on the planet to home in on. I just want a destination to fly to, but no joy. I would settle for a Wal-Mart to target. I did manage to land and take off again. And that is the sum total of my accomplishments to date; after about three hours I successfully made planet fall and then lifted off the surface again, flying east. So far I havenÔÇÖt hit sunrise, I assume the planet still orbits a star. As for the six billion people and the infrastructure that supports them I have seen no evidence.