To get to Form 4797 and edit it, search for sale of business property in the search box and select the Jump to link in the search results.
Make sure to select the first checkbox at Any Other Property Sales? screen.
Then next screen, Sale of Business or Rental Property, should allow you to Edit.
To return to the installment sale section of your return, enter installment sales in the search box and select the Jump to link in the search results.
Form 6252 for Installment Sales will be available very soon; Form 4797 is available now.
For the most recent update, check at: IRS forms availability table for TurboTax.
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