You search for Picasa web and click the first result, but instead of the interface that you’re used to, you see a new, unfamiliar page. What’s going on?
Google has integrated Picasa Web Albums with Google+ Photos. When you upload a file to Picasa Web Albums, it also shows up in your Google+ Photos and vice versa. Similar, if you delete a picture in one place, it is also deleted in the other.
Google+ Photos
Picasa Web Albums
In Picasa Web Albums, you can set the permission for your photos and albums as one of three visibility options: 
I have two albums that are public, one with limited visibility and one private one. See what my albums look like when I am logged into each account:
Albums when logged in to Google+
Albums when logged in to Picasa Web
People who visit my Google + Profile page can only see my public albums:
Google+ Public page
To include slideshows to your blog posts, you may upload your photos to either Google+ or Picasa Web Albums, but you must get the slideshow embed code in Picasa Web Albums.
Need help with another step? Post a comment and I’ll be happy to create a blog post for your situation.