Which program are you using?

Your professional tax preparer should be able to assist you with that.

You could complete the form here https://www.irs.gov/pub/irs-pdf/f1120.pdf and and mail here https://www.usps.com/ship/online-shipping.htm and pay here https://www.eftps.gov/eftps/

If you want to get a software product realllllllllllllllllllllly quick go to https://proconnect.intuit.com/tax-online/ and click the TRY IT FREE.