To change your Magento admin password, go to your cPanel > phpMyAdmin, select your Magento database, click the SQL tab and paste this query:
UPDATE admin_user SET password=CONCAT(MD5('sGnewpass'), ':sG') WHERE username='AdminUsername';
Note: You have to change newpass in the MD5('sGnewpass') with your new password, and change *AdminUsername* to your Magento admin username.
Execute the query by clicking the Go buttong and your password will be changed.
