This is normal -- the warning is because your control panel powered web hosting server is using a self signed certificate to encrypt and protect your communicatoins over an SSL connection. Some web browsers will prompt you with a warning or notification. To to avoid seeing this warning again: ...
The quickest way is to use the control panel to update to the latest version of PHP with the included default extensions, but there are cases where you may need a specific version of php (older, newer, or with a specific configuration built into the php software). In cases where you can not use ...