Most site that require a password will offer a "forgot password" link. They will send it to the e-mail address on file or your phone of you set that feature up. What site is giving you a problem? If it is another computer, provide some more info for a better solution.
If you are trying to retrieve password for any online account/email, you will be prompted for entering alternate email id. Or, You might be prompted to answer secret questions you would have filled during registration.
Detailed info from you would help to answer accurately.
IF you are referring to your Windows password, the best way to reset it from within Windows is to hit Ctrl-Alt-Del, the select "Reset Password." It will walk you through the change.
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