Should I have entered Social Security and medicare amount taken from paycheck on my return?

You should, yes. To adjust your W-2 entries, read on:

1. From Tax Home, open or continue your return.
2. In the upper right menu, select search and search for W-2.
3. This will bring you to your W-2 entries. Select the W-2 in question and add in the missing information. 

When you enter your W-2 into the software you are supposed to enter the data from every box of the W-2.