Yes you can.
Login to Cpanel and click on access the database via PHPmyadmin.
Look under the users table (commonly wp_users) and find your account, the login name should show and to change the password, clear the field and type in your new password and then select the dropdown under password and select MD5 and continue.
Navigate to and click the table
Now, in the user_pass field, change the function to MD5 and enter your new password in the Value section (refer below screenshot).