I've followed the Backdoor Roth guidance step by step. I entered Trad IRA 1st, then entered my 1099r, I've deleted forms, and started over 2. It won't work. Please help.

No, you cannot use rollover this is a conversion.

Please be aware that TurboTax summary will include the conversion because it shows gross income. To verify your entry you will have to look at Form 1040 line 4.

1. Click on "Tax Tools" in the left menu
2. Click "Tools"
3. Click "View Tax Summary" in the Tool Center window
4. Click on "Preview my 1040" on the left

When you enter your contribution you need to make sure you make it nondeductible (see step 10 below).

Please review the steps below, if this does not help then please provide more details. Are you not getting to certain questions? Was the contribution made for 2020? What is the code in box 7 of your 1099-R, box 1 and box 2a entry?

To enter the nondeductible contribution to the traditional IRA:

1. Login to your TurboTax Account 
2. Click on "Search" on the top right and type “IRA contributions”
3. Click on “Jump to IRA contributions"
4. Select “traditional IRA”
5. Answer “No” to “Is This a Repayment of a Retirement Distribution?”
6. Enter the amount you contributed
7. Answer “No” to the recharacterized question on the “Did You Change Your Mind?” screen
8. Answer the next questions until you get to “Any Nondeductible Contributions to Your IRA?” and select “Yes” if you had a nondeductible contributions before this tax year.
9. If you had a basis in the Traditional IRA before then enter the amount.
10. On the “Choose Not to Deduct IRA Contributions” screen choose “Yes, make part of my IRA contribution nondeductible” and enter the amount.

To enter the 1099-R distribution/conversion: 

1. Login to your TurboTax Account 
2. Click on "Search" on the top right and type “1099-R”
3. Click on “Jump to 1099-R”
4. Click "Continue" and enter the information from your 1099-R
5. Answer questions until you get to “Tell us if you moved the money through a rollover or conversion” and choose “I converted some or all of it to a Roth IRA”
6. On the "Your 1099-R Entries" screen click "continue"
7. Answer "yes" to "Any nondeductible Contributions to your IRA?" if you had any nondeductible contributions in prior years.
8. Answer the questions about the basis