There are few ways to change password
If you have access to the admin panel, log in and click on "Update Profile"
The password-reset page is generally located at:
http://domain.tld/wp-login.php?action=lostpassword
where “domain.tld” is the location of your WordPress installation.
Once you request a new password, an email is sent to the email account with which you registered. In that email is a link to reset your password, which is finally sent back to your email account.
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Log in your control panel
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Go to phpMyadmin
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Browse the database created for your Wordpress and find the “wp\_users” table
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Click on the user you want to edit
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Go to "user\_pass" and under Function chose MD5
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Enter your new pass and click "Go"
