You can't access the form from inside TurboTax Online. If you need to make changes, you will need to visit the applicable section (Rentals, Royalties or K-1) in TurboTax Online and make your changes via the interview screens.
You can, however, print or download your entire return to see your Schedule E. If you have not filed yet, use the Print Center which can be accessed from the Tools menu on the left. If you have already filed, you can print or download your forms from the Tax Home page. When you sign in, that is the page you will see if you have already filed. Just scroll down and select the print or download PDF option.