"Ready to mail" means that your return will be printed (by you) and
mailed to the IRS. If you chose direct deposit for your refund option
then your refund will still be sent this way after the IRS processes
your paper mailed return.
If you'd like to e-file (electronically send your return to the IRS) then see the link below for more information:
https://ttlc.intuit.com/replies/3985787