I can't open grub.cfg on Parrot Security OS

So, I made a dual boot with Windows 10 and Parrot today. After I set up Parrot I restart my PC to boot up Windows. My pc opens in grub and I select Windows 10, I have a blackscreen for half a second and I see the grub menu again. I have found a solution for this but when I open grub.cfg I get an acces denied message in Pluma (pluma is my default text editor). I try to open it in Atom and it works, but I can't save it. I changed the owner of the file from root to my user and gave everyone the read, write and execute permission and it still says acces denied. How can I get acces to Grub.cfg, or maybe you know how to fix the issue where I can't boot windows from grub.

Originally Posted by Critical Side I changed the owner of the file from root to my user and gave everyone the read, write and execute permission

WRONG!!!!!
undo that immediately, then use either sudo or su to edit that file:

sudo nano /boot/grub/grub.cfg

but be aware that all changes are lost after a grub update.
the canonical way is to edit /etc/default/grub instead, then run

sudo update-grub

afterwards.

please be careful when editing system files.
if you aren't 100% sure you're doing the right thing, you probably shouldn't do it.

or add a window entry by editing /etc/grub.d/40_custom then run update-grub