Do you really mean 2018? If you do, you are over a year too late to get an extension for 2018. The filing deadline for people with 2018 extensions was October 15, 2019.
Do you mean you want an extension for 2019?https://ttlc.intuit.com/community/extensions/help/how-do-i-file-an-irs-extension-form-4868-in-turbot...
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