What is a master password?

Lcdesigns62 wrote:

My daughter has a Mac laptop that we bought 2010. She needs to login to her computer but she doesn’t remember her password?

Forgot Admin password—

Reset your Mac login password - Apple Support

https://support.apple.com/guide/mac-help/reset-your-mac-login-password-mh35902/mac

Change or reset the password of a macOS user account ...

https://support.apple.com/en-us/HT202860


Five Ways to Reset a Lost Administrator Password - TidBITS

https://tidbits.com/2014/01/17/five-ways-to-reset-a-lost-administrator-password/

Since it's a 2010 Mac, the support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.