How do I file for an extension

Detailed instructions for using turbotax to request an extension:
On the menu bar on the left that shows.

My Info
Federal
State
Review
File
Select Tax Tools
On the drop-down select Tools
There will be 4 green boxes
Select Tax Topics
Type Extension
You can then start the extension process

Also, you may have to do your state taxes:
https://ttlc.intuit.com/community/extensions/help/do-i-need-to-file-a-state-extension-if-so-how-do-i-do-this/00/25693

Remember, an extension gives you more time to prepare your taxes, but it doesn't extend the time to pay your taxes. If you have an indication that you will owe taxes you should make the payment to avoid additional interest and penalties.

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Just go to "Forms" view and open Form 4868.  Fill it out and send it in.

This will extend your deadline for filing your tax return, but you still have to pay on time or you might get interest and/or penalty charges.  So try to pay a little more than you think you need to today.  You will get back any excess when you file the return.

Please follow the steps below to file the extension:

1. Login to your TurboTax Account.
2. On the Bottom Left of the screen, there will be an option for "File an Extension". Click on it. You can then enter the information and file the TurboTax Easy Extension.

Additionally, you can follow these steps below as well:

1. Click on Tax Home from Left Side Menu.
2. Click on Personal Info from main screen and click on Continue.
3. On the top right screen, click on the magnifying glass with the Search Word and type Extend. You will see a Jump to Link. Click on it and you can file the extension.

Please visit How do I file an IRS extension (Form 4868) in TurboTax Online? for more information.