I recommend for trivial issues (by trivial I mean issues you can easily find and answer/solution to by searching on this very same forum or any search engine) you use a search engine. searx.me is excellent IMHO.
That being said ->

sudo passwd root and enter the psswd for the root (make it complex and long passphrase)
su root to become root

Also changing network or any files in / you should be perfectly capable doing using sudo. Hence no need to create a root account..
cheers

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