It is really easy to put a slide show of a series of photos on your blog. First download a free copy of Picasa from google. It will organize all the photos on your PC so you can find them easily.
Next, open Picasa and chose the photos you want in your slideshow by holing down ctrl and clicking on them with your mouse. Now choose upload to put hem on your free online Picasa album. After they upload click on "view online". On the right side choose the icon that looks like a link. Choose embed slideshow. Copy the HTML into your a "new post".
Save and add any comments to your post. Then "View Blog" and enjoy!