My 2017 returns were rejected on October 16 (I filed OCt15) I missed the October 20 deadline, how can I fix and resubmit my return?

My 2017 returns were rejected on October 16 (I filed OCt15) I missed the October 20 deadline, how can I fix and resubmit my return?

Turbotax had a page saying the would walk me through the return to correct mistakes, but all I get now is "to download turboTax software"

What do I do?