To upload photos to Picasa you will need a Picasa account, as well as internet access. Also, the PicasaWeb extension must be installed and enabled.
Select the photos you wish to upload.
Click Photo ▸ Export To ▸ PicasaWeb....
Add a gallery by clicking Add and supplying a username and password.
Select a gallery to export to, or click Add to create a new gallery.
Click Export.
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