How do I sign up for a tax exemption on turbotax?

[Drdude]

I need details to sign up for tax exemption till pay in October due to K-1 forms that arrive after April 15

[xmasbaby0]

You mean an extension?  The form to request an extension becomes available around mid-March.  An extension gives you extra time to prepare your tax return and file it; an extension does not give you extra time to pay your tax due.   You must pay your estimated tax due by April 15, 2025 even if you request an extension to file.