When you finish with the first Form 1099R,you will see a blue hyperlink button that shows "Add another 1099-R" below the first one. (see the images attached)
You can go directly to the area to enter the document by following these steps.
1. Sign into your TurboTax account (online) and select your current return.
2. Select My Account on the top right and then select Tools
3. Select Topic Search (see attached image)
4. Search for 1099r and select Go
5. Follow the interview to enter or review your entry for these benefits.
TurboTax desktop version:
1. Search box in the upper right
2. Search for 1099r
3. Jump to 1099r
4. Continue to enter your Form 1099R from the statement