Focusing the Finder
The Finder Scope has a focuser at the front, and a focusing lock ring for once focus has been achieved. Focusing is really a set once and leave forever affair and it is unlikely you will ever need to refocus.
The only thing about the focuser is that it seems to require many turns to move in or out of focus, so it can be difficult to tell whether you need to rotate clockwise or anticlockwise, and by how much to achieve the desired focus. Focusing is therefore best done initially during daylight hours against a distant object. You can then tweak it more finely on a bright star at night.
After focusing you can then move on to aligning the finder.
Aligning the Scope
Obviously the finder scope must be aligned accurately with the main tube for proper use.
Again this is something best done during daytime, and against a distinct object at least 1/4 of a mile away, such as a telegraph pole.
After positioning the view in the main telescope using the 25mm eyepiece, use the adjusting screws on the finder scope to align the crosshairs with the object the main tube is aligned to.
Note that the image in the telescope view will appear upside-down as is usual with Newtonian reflectors, compared to the view through the Finder Scope which is made normal by the right-angle image corrector.
Other Topics in this XT10 Review: