A single-member LLC (unless an election to be taxed as a corporation was made) is a disregarded entity and files an individual income tax return (1040) along with a Schedule C for the LLC.
If you reside in a community property state, the LLC is owned only by you and your spouse, and not treated as a corporation, then the LLC is a qualified entity and you can elect to treat the LLC as a disregarded entity and file two Schedules C rather than a 1065. In that event, you could file an amended return with the second Schedule C.
See https://www.irs.gov/pub/irs-drop/rp-02-69.pdf
In any other event, you would have to file a 1065 for the LLC if both you and your spouse are members and you would need a product such as TurboTax Business (link below) to prepare Form 1065.
https://turbotax.intuit.com/small-business-taxes/
