Welcome back, Connie! Congratulations on home testing! You're doing a great job! I do recommend getting the PM readings before shooting (giving insulin) because anything can happen in the evening. A cat can go too high after being low for awhile and a cat can go too low and go hypo.
It will help if you can load your #'s in a spreadsheet members use here so we can help you more easily. Plus, it will guide you as well:
http://www.felinediabetes.com/FDMB/threads/fdmb-spreadsheet-instructions.130337/
If you need help with setting up the spreadsheet, just let us know.
You can poke anywhere on the ear (inside or out). The reason we suggest poking in the "sweet spot" is that is where you're less likely to hit a vein and get too much blood coming out. For the black ear, perhaps gently shaving off a little bit of hair around the "sweet spot" would help. If not, a flashlight can be handy. Otherwise, you can try poking outside of the "sweet spot" on the non-black ear but you may get more blood than you would like!