In error I selected I had rental income. I do not. How do I delete Schedule E from my return?

Change to Forms in the upper left corner and then see all the forms included in your return. You should be able to either click on it and use your Delete key or right-click delete form.  or with it highlighted, click on the Forms option at top, look for a Remove Schedule E option.   I just realized your post said the Online version, but hopefully there is a similar option to my desktop TurboTax Premier.

In TurboTax Online, you will need to delete the Schedule E created by your answer about rental income.

You can find this under Federal >> Wages & Income >> Rental Properties and Royalties (Sch E).

Click Edit to see all the Schedule E activities in your return. Use the trashcan icon to delete the one you don't need. Click Done to save your changes.