How do I delete this business it was made by mistake

You can manually review a section or delete a specific form/worksheet in 2 different ways. To manually review a section, you will manually go there and click the trash icon next to the section you want to remove (in this case the specific business).

It is not recommended to delete a form or worksheet directly. Instead, we recommend to go over each specific section of the return from the beginning, double check your entries and answers, and remove any necessary information. If everything is correct and it still populating that form or worksheet, follow the instructions using the links below to delete that specific form.

How to Delete a Form on TurboTax Online

How to Delete a Form on TurboTax Desktop