I would like to enter the information for 1099-R MYSELF. how do i get to the input screen?

Here's where to enter your 1099-R in TurboTax:

1. Open or continue your return
2. In the Federal section, select Wages & Income
3. Scroll to locate Retirement Plans and Social Security, and select Show more
4. On the following Screen Did you Receive Any 1099-R form? Answer Yes to the question Did you Receive any of these types of that Income?
5. Continue and on the following screen select, I'll Type it in Myself.