In your connection file, you entered an extra ' for the host name:
$hostname_conn = "'lasample.ipowermysql.com";
$hostname_conn = "lasample.ipowermysql.com";
The error you are getting on the code the host gave you indicates that the user "sung" has not been granted access privileges to the database on the MySQL server. check with them on that error, they should be able to assist you in granting access privileges to the Sung user for the database.