If you don;t have withholding, estimated quarterly payments are due April 15, June 15, Sept 15 and January 15. You make the payments yourself by mailing a check or making an online payment at www.irs.gov/payments. You don't include any kind of tax return, just the money.
Turbotax is only designed to do the end of the year tax return. If you are self-employed and need to estimate your quarterly payments, you may want to look at quickbooks. If you just have a lot of un-taxed income, but are not self-employed, this IRS calculator might help.
https://www.irs.gov/individuals/tax-withholding-estimator
