Once you have all the moments, you divide by the total mass and you have a distance from the datum, or reference point. Since the CG moves, it is not the datum. The datum is usually a part of the structure somewhere, like a former/bulkhead. There is usually a forward limit and an aft limit, from the datum, that indicates where the CG can be. I'd love to see the other 5 pages. Surely, they must be around somewhere if that one page is uploaded?