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.
Here's wishing you many Happy Returns
