I don't know my administrator's name in order to make changes in system preferences.

I cannot make any changes in system preferences because whatever 'administrator name' I put down will not work. The password is correct. What steps should I take?

Thank you so much for your help. I apparently had the wrong Admin username somehow, and found it by typing
dscl . -read /groups/admin GroupMembership | open -ef
into Terminal. A text box popped up with the root username.

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