How do i change the master password without knowing the previous password

I need to reset the master password on my macbook, but I don't know the previous password.

There is no 'default'
The admin password is set individually for each account. If you are logged into your account and your account is an administrator account then you have set the admin password, if you did not set it for yourself who did? is there an IT dept in this company?
If you are still signed into someone else account and Find My Mac is active you will need them to sign the Mac out of their account so that you can sign into yours.
For a company issued machine this is a very poor handover.
Good luck.

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