To enter form 1099-R:
Click Federal Taxes (top menu)
Click Income & Expenses (just below top menu)
Scroll down to Retirement Plans and Social Security and click Show More (if necessary)
Click Start next to IRA, 401(k), Pension Plan Withdrawals (1099-R)
Enter your 1099-R exactly as printed, paying special attention the the distribution code in Box 7 and the "IRA/SEP/SIMPLE" box.