Hi Orestis.
Marc got the right idea, but to work out the max exposure without trails, divide 700 by the focal length of the lens of your camera (if you check you booklet it should give you min and max focal length) Usually little point and shoots have about 8 mm to ??? . So if you were zoomed out to the max (say 50mm) then you will only get 14 sec of exp before you start to get trailing. At 8 mm you will get roughly 90 sec. Give it a try
Also focusing is a bit of a challenge as will if you don't have manual focus. There needs to be something bright enough for the camera to focus on.