I have forgotten my MacBook 2006 password

Reset Computer Password  for the Administrator Account Password

Intel Computer

1 - Restart computer and immediately hold Command + r keys

2 - Top Tool Bar >> Utilities >> Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

Apple Silicon M1 Computer 

1 - Choose Apple menu > > Shut Down.

2 - Press and hold the power button on your Mac until you see “Loading startup options.”

3 - Click Options, then click Continue. 

4 - Top Tool Bar >> Utilities >> Terminal

5 - Type resetpassword as one word and no spaces

6 - Press Return key

7 - Follow the prompts and remember the New Password

You are sign in here .  .  .  with your Apple ID & Password (?).

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

See the following Apple articles:

If you forgot your Mac login password

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

Reset your Mac login password

https://support.apple.com/en-mn/guide/mac-help/mh35902/mac

Change the login password on Mac

https://support.apple.com/en-gb/guide/mac-help/mchlp1550/mac

If you forget your Apple ID or password

If you forget your Apple ID or password – Apple Support (UK)

Sign in with your Apple ID

Sign in with your Apple ID - Apple Support