In order get rid of certificate warnings, you should trust the ​publisher of this site. In order to do so, take the following steps (Internet Explorer, ​other browsers will ask you if you want to trust this site or not and not bother you further).

• Open the authority certificate Orca Software CA.
• Choose "Install Certificate" in the dialog that opens.
• Choose "Place all cert.." in the "Certificate Store" dialog and "Browse" for the folder "Trusted Root Certification Authorities".
• Ignore security warnings about installing the certificate. You know what you're doing. You're just trying to visit this site without nag screens. It's OK, really.