Q: how do i restore my new 6s plus from my 6 settings?

See the following instructions; Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support

If you've already setup the new phone you will need to do the following before restoring:

To transfer a backup to a device you've already set up, you need to erase the device: Tap Settings > General > Reset > Erase All Content and Settings. This will erase any data that's currently on your device. After you've erased it, your device will restart and you'll see the "Hello" screen. Now you can transfer a backup to your device.