There are two ways to access the CreatePDF service. You can access the service through Adobe Reader (version 10.1 and newer) or via your web browser.
Adobe Reader:
You can access the CreatePDF service within Adobe Reader by choosing File > CreatePDF Online. The 'Tools' Panel of Adobe Reader will open. Click the blue 'Sign In' text. Enter your Adobe ID (the email address you used when you subscribed to the service) and your password, then click the 'Sign In' button.
Once you're signed in, click the 'Select File' button to choose a file to convert, then click the 'Convert' button. When the conversion is complete, you'll be prompted to 'View PDF File in Reader'
You can download the latest version of Adobe Reader here: http://get.adobe.com/reader/
Web Browser:
Open your web browser and navigate to http://createpdf.acrobat.com. Enter your Adobe ID (the email address you used when you subscribed to the service) and your password to log into the service. After you're logged in, you should see the CreatePDF interface. Click the 'Convert to PDF' option along the right-hand side. Then click 'Select Files' to get the process started.