i cant log in my iphone6

Sorry, but if you have forgotten the code for your lock screen and the phone has been disabled, there is only one way to get access again: Erase the device, using the computer and iTunes, then set it up again form the latest backup. You will be able to create a new code during this process.

Follow the steps, mentioned in this article:

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support