In much the same way as adding a picture, this is how you add a flash document to the page.
1. Get to the edit component screen and edit HTML content.
2. Select the flash button as per picture below.
3. Then browse the server.
4. Upload the flash document like you would a normal image file.
5. Once this is done, select it and you should get a red square placeholder indicating that the flash document is on your page.