If you answer all the income questions, then go to the Deductions and Credits page, and simply click "done" at the bottom without running any of the sections, turbotax will assign you the standard deduction. (The program will still ask about a few common deductions to make sure you haven't missed them, but you can answer "no" to everything if you already know you want to use the standard deduction.)
Of course, the whole point of Turbotax is to enter everything so you "don't accidentally miss something" and let the program choose for you in the end, but you can bypass that if you know you don't need it.
