If you take a look at my tracker, I have a 4th section for Vitamins, which is where I list the vitamin and calcium supplement I take. You can add this section (assuming you're on a computer, not sure how to do it from the phone, but it'll appear on the phone if you do it from the computer). Right below where the date is listed, there is a drop down menu for "tracker options", and "Add an extra meal category" is listed. Click on that and then click where it says to add, and you can add whatever you want, name it whatever you want.
Then, in order to see the Vitamins listed, you have to go at the top of the tracker (in the green bar) and click "Add More Nutrients". From there you can pick the ones you want to add. I personally only track a few of them, Fiber, Vitamin D, Vitamin C, and Calcium. I think you would make yourself crazy if you tried to track everything, especially since most are not required to be on a nutrition label so the information isn't really accurate anyway.
Once you've added what you want, it won't appear on your main tracker screen, but down towards the bottom in the Weekly Progress you can see what your totals for the day are. If you want to see the breakdown of each food, click on the "See Today's Full Report" button.