Click the profile button in the upper-right corner and select More... under Tools.
Click Configure under the Calendars tool, or click here.
Make sure the Enable Calendar Subscriptions box has a checkmark. If it doesn't, check the box and then click the Save Changes button.
Right-click the URL under Events.
Copy the calendar URL by clicking the Copy link address command on the popup menu. Depending on your web browser, this command might be named Copy shortcut or Copy Link Location.
After copying the link, the address field at the top of the Add Calendar Source - Toodledo window should be automatically filled. If that doesn't happen, right-click the address field and select Paste from the popup menu, or press Ctrl+V.
Enter the name for your Toodledo calendar in the field below the calendar address field.
The OK button will now be enabled. Click the OK button to add your Toodledo tasks to PrintableCal's list of available calendar sources.