I filed our state & fed taxes this week & set up my pymts to them to deduct on 4/15; however, I need to wait to pay these tax bills for another two weeks.How do I fix?

You need to call the IRS payment services hotline ASAP (1-888-353-4537).  Since your return was filed and accepted, the banking information is sent to the IRS and TurboTax has no further control over it.  You need to call that number and attempt to cancel your scheduled payment.  According to the IRS, requests must be received within two business days of the scheduled withdrawal date.

For more information - 

https://www.irs.gov/payments/pay-taxes-by-electronic-funds-withdrawal

You will need to do the same thing with your State Department of Revenue (depending on the state, they may or may not have an option to stop a payment)

https://ttlc.intuit.com/replies/3302452