How to insert your slideshow:

Go to Picasa Web Albums (http://picasaweb.google.com/home), and log in with the Google account that owns (or you want to own) the album.

1. Check that you have already uploaded the album you want from your PC to Picasa-web-albums.
   (and if you haven't, go back to Picasa and upload it now)
2. Choose an album by clicking on it.
   The album view opens, showing you a thumbnail of all the photos in it on the left of the screen. On the right of the screen, there is a sidebar of useful tools.
3. Under the Edit drop-down (the one in the album, not the edit menu in the browser), check that Visibility is set to either "Anyone with the Link" or "Public on the web"
4. Click on "Link to this Album"  (currently it's in a small font, 3/4 of the way down the right-hand sidebar - this may change if Picasa changes its interface)
   
5. Click on "Embed Slideshow"  (currently this shows up underneath "Link ... " - and only AFTER you've clicked link...)
   This opens a new dialog box, over the top of your current browser window.
   
   
   
   
   
   
6. Fill in the details you want
   (slideshow size, whether or not to show captions and to autoplay the slides, etc)
7. Copy the HTML from the box at the bottom of the left hand-side (the one labelled "Copy and paste ..."
8. Go to Blogger and log in with a Google account that has rights to edit the the blog - note that this doesn't need to be the same account that owns the Picasa album.
9. You can put the code that you copied into your blog in the same way you would adding any other 3rd party HTML to it.