You have several options:
1) Use Turbotax to request extension
See https://www.youtube.com/watch?v=2Vu4agRok68.
2) Use IRS site to request extension
https://www.irs.gov/forms-pubs/extension-of-time-to-file-your-tax-return
3) Print the extension request form and mail it.
https://www.irs.gov/pub/irs-pdf/f4868.pdf
Due date is today. Postmark by today is okay.
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