I can't figure out how to use TurboTax online for first partial year LLC estimated payments

I started a single-member LLC in August 2025 (two months ago). I cannot figure out how to use TurboTax Online to determine estimated payments I probably need to make by the January 15, 2026, filing deadline. When I log in (long-time user as a W-2 employee), it seems I can only start a new 2024 return.