Why won’t it let me take it back to make it a single llc not partnership ?

[Vanessa A]

Where are you seeing this?

If you have a Single Member LLC, the income and expenses are entered on Schedule C.  Schedule C will not allow it to be a partnership. That is for sole proprietorship. 

If you have a partnership, you would need to use TurboTax BUSINESS NOT Home and Business, which would report the income on a 1065 then give you a K-1 to enter on your personal return.  If you have a Single Member LLC, that did not elect to be treated as an S-Corp, you should not be using TurboTax Business.