You are not signing your electronically filed return to the IRS with a normal signature, instead, you are using a PIN, last year's AGI, to verify yourself. Accepted means your tax return is now in the government's hands and has passed the initial inspection, so you won't need to do anything more. After acceptance, the next step is for the government to approve your refund if due one. Please see the information in this TurboTax FAQ here for assistance.
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