Since you are using TurboTax Online, you don't have direct access to the Forms and Worksheets.
You will need to EDIT the Asset you need to change in the section of the program it is entered.
For example, if a Rental asset, go the Rental Income& Expenses section.
If a Business Asset, type 'schedule c' in the Search window, then 'Jump to schedule c'.
Or, here's how you can Delete a Form from your return:
https://ttlc.intuit.com/replies/3288508