First upload the image into the Cascade. Next navigate to the desired page, choose edit and position the cursor where the image should be placed. An Insert/Edit Image window will open. Select Choose File in the Image field and navigate to the previously uploaded image file. Select the image and click the blue Choose button. The image file name will appear in the Image field. Input an image description (previously called Alt Text/Tag). Select Ok.
External images are those stored outside of the Cascade system and referred to by their http:// address when they are placed on Cascade pages. Since externally stored images are on someone else's web site and can be modified or deleted without notification, using external images is not recommended.
Additional information on adding images can be found here.