your instruction isn't complete mate.
Do you need to login your own expired netflix account?
His instruction is complete :)
If you download any of the "Cookie Import Addons" you just need to copy/paste the code he posted and save it as .txt file.
After that you import this file with your downloaded addon.
When the cookies are imported there is no need to have any account , cause it will login the account which is saved in the cookies.
Just open the website of Netflix and you have everything you need :)