How do I start over with reporting my crypto? I started to enter by hand but now I want to go back an import it. It won't let me go back.

If you are using TurboTax online, go back to the Income & Expense section, and scroll down to the section for Stocks, Cryptocurrency...etc. across from which you will probably see the Review tab.  If you click on the Review tab, you will likely see a summary of what you have entered thus far.  You should also see near the bottom left of the summary section Add more sales.  Click on Add more sales, and the next screen will show you various topics to select.  When you click on the one for cryptocurrency, the next page(s) will prompt you to start the import process.

Now, if you chose to select the import method to upload your cryptocurrency transactions, you will likely have to go back to the summary page mentioned above and delete your original entry.  Deleting is easy.  Just click the trash can icon next to the Review tab.