I am on Live Linux USB of Porteus linux and I copied it to RAM.
I want to access root folder for making changes so that settings gets saved.
but this is showing up
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According to this site, the default root password is toor.
If you can log in as root using that password, you should be able to access that folder. If you are logged in as a guest, then from the command line you can switch to root with the command
su root, and then enter root's password. As root, you should be able to access the folder you are trying to access. Additionally, running a file manager like dolphin should give you access through a GUI file manager.