Hello! I have Dry Skin Should I use moisturizer on the areas of the skin which is affected. Or all over the body? Also Do you rub it in or dab it?

All over. You never know which part of the skin will dry up next. Using the cream all over the body should prevent dryness, & should be safe as long as the cream is hypoallergenic, and well-reputed brand. Avoid creams with excess perfumes, colorings, bleaches, "whiteners" or other additives. These can dry out skin & cause more problems in the future. Good luck.