It is not unusual for a 1099-DIV to be updated or corrected. Enter the corrected one or the one with the most current date.
If you need to delete original form see below:
Here's the general procedure for viewing the forms list and deleting unwanted forms, schedules, and worksheets in TurboTax Online:
Is it possible to see the details of the import after it is in Turbo Tax?
Yes, all details are available to see in TurboTax.
Yes, you can enter your 1099-DIV manually.
Where do I enter my 1099-DIV in TurboTax Online? (intuit.com)