Okay... we can help you... There are several YouTube video tutorials that walk you through the process... simply searching YouTube for "lens fine tune D7000" will get you started...
Basically, you need a target to take pictures of... depending on which way your lens is focusing front/back, you make adjustments in your camera... Your camera reads the chip for the lens and creates a small database for each lens you attach...and reloads/adjusts for each lens whenever you put it on the camera...
Take a picture, make an adjustment, take another picture to re-check the adjustment... make another adjustment until you dial-in the adjustments for that lens...
The Youtube videos will also point you to a target... You can buy a target, or you can print one off the internet...
Here's a link to the latest version of ViewNX2 if you wanna start over...but I doubt you'll get much satisfaction by sending the images to Nikon without being able to tell and demonstrate that the camera/lens can't be fine tuned within the limits of the camera...
https://support.nikonusa.com/app/answers/detail/a_id/18567