No worries
Instruction leaflet here. Basically same scope, different brand but will get you the same result. Seem to recall the GSO didn't have one in the box when I got mine.
https://www.astronomics.com/document...c%20manual.pdf
Really small adjustments needed. Don't go mad.You shouldn't need to touch the main mirror and if new to this, and are not sure, just focus on the secondary and see how you go.