The previous owner of my macbook pro worked for a school and did not fully wipe before selling to me. There are still restrictions on some things. The most frustrating are installing chrome extensions and connecting to iCloud. I have administrative rights but no idea where these types of permissions are located. I am also unable to update the OS any higher than El Capitan.
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Edie
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You should definitely wipe the entire MacBook before using it for anything. You should never use a previous-owned computer without wiping the drive, re-installing the system, and using it as a "new" computer that is completely yours. Otherwise, you never know what the previous owner may have left behind. Even if they had no malicious intent, you don't know if they were careless and downloaded some malware, stolen software, or illegal content.
If you have already used this Mac and have files stored there, I would get them off and put them on an external drive. Make sure you have them and they are safe. Then sign out of everything.
Here is a tutorial on how to erase and restore your Mac: Erase and Completely Reset Your Mac.
Once you have it restored, continue by using the Mac App Store to update to the latest version of macOS that it can take.
If you had previously signed on to ANYTHING on this Mac before you wiped it, I would change your passwords on all of your accounts: iCloud, email accounts, banks, shopping, Google, etc.
Yikes! Will do. I've been using it for about 2 months. I've signed into everything!
Edie, depending on the situation, after completely wiping the MacBook, it might still be locked by the school because of a device management program that they have. Based on that, you might need to get ahold of the school and have the removed from their database(s).
I didn't even get that far. Before I can enter Internet Recovery Mode, I see a Grey image of a padlock with a password box. My password does not work
Edie: Oh no. That means that someone set a firmware password on your Mac. If you don't have that password, and have no way to get it, then you'll need to take it to Apple. See the bottom of this page: https://support.apple.com/en-us/HT204455
Before you do that, you can try this, which will work only in some situations: reboot while holding Command+r to enter recovery mode. Go to Utilities in the menu and choose Firmware Password Utility. Turn the firmware password off. If that doesn't work, then only having the password or taking it to Apple will help.