my iphone 6s is stuck on the iTunes logo and I cannot get in to reset it.

Hi

Follow the steps here, including contacting Apple Support (mail-in service may be available, if required), making a Genius Bar reservation or visiting an Apple Authorised Service Provider if necessary:

If you see the Connect to iTunes screen on your iPhone, iPad, or iPod touch - Apple Support

Note that, for iTunes to be able to connect with a device running iOS 10 or newer, your computer must be running iTunes version 12.5.1 or newer:

Get the latest version of iTunes - Apple Support

Try to reset your device. This won't delete your data stored on this device.

• Press and hold the Sleep/Wake button
• Press and hold on the Home button
• Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings

If this does not help, restore your device to factory settings. Note that this will erase the data from your device.

Take a look this Apple Support article: Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.

As a final step, try the recovery mode. Turn your device off, then plug it to your computer with the home button pressed. Keep the Home button pressed until you see the iTunes logo on the screen of your device. After that on your computer you should see the iTunes window saying your device needs to be restored to factory settings. Click on the restore button.