Sorry, but you are too late to request an extension unless you are out of the country. You had to request an extension by April 15. If you are getting a refund there is no penalty for filing late. If you owe tax due, then now you are just late. The IRS will calculate and bill you for penalties and interest that apply after they receive your tax return and payment for the tax due that shows on your Form 1040.
https://ttlc.intuit.com/questions/2549773-can-i-file-an-extension-after-april-15-2019
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
