I got a call but nobody was talking I need to know how to mail my federal refund of $2,742?

Mail my refund? Or do you mean mail my balance Due?

if refund, the IRS should mail or Direct Deposit your refund.

if payment due, google IRS Form 1040-V to locate your states IRS mailing address and send 

check payment with completed Form 1040-V

Are you trying to mail your tax return in?  If so, please see the link below for addresses to use to mail your return as the address changes based upon your state of residence.

Addresses to file a return with the IRS

If you still need to talk to someone, please use the following link to contact us.

Let the agent know what is happening and they will be able to assist you. 

Contact TurboTax