Start your IIS Manager to install the received SSL certificate. Double click on Web Sites. Right click on the appropriate website that is the same site where the associated CSR is generated. Select Properties from the menu.
In the Properties window, select the tab Directory Security. Select Server Certificate which is located in Secure communications section.
You will be guided through several windows to install the received SSL certificate.
In the first window, you must select Process the pending request and install the certificate. Click Next to continue.
During the next step, you can choose if you want the certificate request sent immediately or later to a CA. Click Next to continue or Back to change previous selections.
In the next window, enter the location and filename of the SSL certificate you received from Buypass. Prior to this, you have to save the certificate as a text file on the server. After that, provide the name and location of the text file or select Browse to locate the file. Then click Next to install the certificate.