I was attempting to make Windows 8.1 my default boot and it disappeared from my boot list! Now Im stuck on Kali and I dont know how to use it!! LOL!

I remember I was just a wee lad. Skipping down the google brick road. When my eye caught something shiny! It was a Ubuntu forum about changing the boot order! I then remember yelling at the top of my lungs:
vi /root/grub/grub.cfg
and the CFG yelled back at me at which point I snatched the words
**** DEFAULT="0"
erased them from existance and wrote them again at the bottom of the CFG; right after the very last 'FI' statement. I continued on my merry way until I found dark woods all around me. And I could not find my way home again. Even though I found maps every 10 feet.

How the $@#% do I load Windows 8.1 back into grub!? I think the Windows boot record is on ****0 and Windows itself is on ****1.

Much sad! Many upset!