How do I install a new password?

Every time I want to download a new application on my MacBook Pro, I am asked to give my password to allow the procedure. Since I have forgotten the password, I have practically lost control over the system. How can I fix this problem?

Administrator Password?
Reset Password
Follow the instructions in the beige and green boxes.
http://pondini.org/OSX/Password.html
Note
You should now be able to log in with the new password, but you won't be able to unlock the Keychain. If you've forgotten the Keychain password (which is ordinarily the same as your login password), there's no way to recover it. You’ll need to reset your keychain in the preferences of the Keychain Access application.
http://support.apple.com/kb/TS1544

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