Your Salesforce.com will need to have a security certificate in order to use SAML. If you don't already have a security certificate, follow these instructions to generate a self-signed certificate.

You may be presented with this screen. If you are, click the Enable Identity Provider button.

Then select your self-signed certificate (1) and click Save (2).

You should now see this screen. Click on Download Metadata. You will use the file you download to configure your settings in ScreenSteps.