On the electronic postmark page of my e return under Federal Return Acceptance date it says,"Your return has been rejected by the IRS". I need to know what to do

See this TurboTax support FAQ for fixing a rejected tax return - https://ttlc.intuit.com/community/rejections/help/how-do-i-fix-a-rejected-return/01/26136

If you are unable to correct the IRS error on the tax return then you will have to print and mail the tax return to the IRS.

See this TurboTax support FAQ for the procedure to print a tax return for mailing when using the online editions - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/01/26258