What Joel says seems perfectly reasonable to me. The camera needs an extension of something like 37mm to focus with the same focus position as a DSLR with a T ring.
Rings are easily available and I would get several, maybe something like 5mm, 10mm 15mm and 30mm. They often come in sets. You can never have too many.
One way to sort out focus is to start in daylight focussing on a distant terrestrial object. You should be able to see something and that will help. This depends on your camera being able to take really short exposures but I think the camera you have will do that.
The trouble with stars is that if you are a long way out it's difficult to see anything because the star disks are so big that they are very dim.
Chris