Hair Density Renewal Serum+

No usable instructions

I hope this stuff works as advertised. However, the instructions on the box are scant: "Apply directly to scalp using dropper to section hair. Focus on areas of concern. Massage into scalp. Do not rinse." So how often should the serum be applied, once-a-day, twice? If once, should it be applied in the morning or before bedtime? How long before you can wash your hair after an application? When should I expect to see results? A video showing the appropriate application would be beneficial. Until I know more I cannot rate this product with anything beyond a single star.