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Details:

If you are testing your site, you can create a self-signed certificate and install it on 
your web server. 
This will provide data encryption; but it is not recommended for a live site. Your 
customers browsers will show warning messages telling that your certificate is 
not issued by a recognized authority. Thus, using self-signed certificates is not 
recommended as it will not instill confidence in customers, and is likely to 
adversely affect your online sales.

To secure your site with a self-signed SSL certificate:

On your Home page, click the domain name you need.
Click Certificates in the Additional Tools group. A list of SSL certificates that 
you have in your repository will be displayed.
Click Add New Certificate.
Specify the certificate properties:

Certificate name. This will help you identify this certificate in the repository.
Encryption level. Choose the encryption level of your SSL certificate. We 
recommend that you choose a value more than 1024 bit.
Specify your location and organization name. The values you enter should not 
exceed the length of 64 symbols.
Specify the domain name for which you wish to generate an SSL certificate. 
For example: www.your-domain.com.
Enter the domain owner's e-mail address.

Click Self-Signed. Your certificate will be generated and stored in the 
repository.
Return to your domain's administration screen (Home > domain name) and 
click Setup in the Hosting group.
Select the self-signed SSL certificate from the Certificate drop-down box. If 
there is no Certificate drop-down box on the screen, this means that you are on a 
shared hosting account; therefore, you need to upgrade your hosting package and 
purchase a dedicated IP address from your hosting provider.
Select the SSL support check box and click OK.