I've just brought myself a new MacBook Pro from a friend I have no idea how to use them I YouTube how to reset a MacBook Pro I done everything all we'll In till you reinstall then it say "this disk is locked"??? Can anyone help me please

I've just brought myself a new MacBook Pro from a friend I have no idea how to use them I YouTube how to reset a MacBook Pro I done everything all we'll In till you reinstall then it say "this disk is locked"??? Can anyone help me please

I done everything all we'll In till you reinstall
Please detail ALL you have done so far in the way of troubleshooting?   Need this info to avoid the been there done that scenarios.
Care to share which OS you are using?
Which MBP model do you have? 

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    Launch the Terminal app, copy & paste this command into the window that pops up, and hit the return key. At the Password: prompt, carefully enter your admin password, since nothing shows up on the screen, and hit the return key.
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    Question
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    If Apple's service database says that your iPhone was replaced, then Apple will no longer provide any service for that phone.
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