Once Picasa is installed, you can run it by going to the Applications menu and selecting Graphics ► Picasa. The first time you do this, you will be greeted by a Picasa License Agreement window. Agree to what you're asked by clicking I Agree.
You will then be asked in another window, and again only the first time out, whether you want it to scan your entire computer for images (the default selection) or just your desktop. Do not, I repeat, do not accept the default (Completely scan my computer and all network directories for pictures).
The reason for this warning is that even though you may have yet to add a single image to your computer, your system is already chock-full of them. If you were to accept the default, Picasa would be filled with all sorts of stuff that you really wouldn't want there. It is supposed to be an organizer for your photos, after all. With that in mind, select Only scan the Desktop, and then click the Continue button. Picasa will then scan your desktop for images and add any images it finds to its library.
Working with Picasa should be very straightforward, but if you want to find out more, check out http://picasa.google.com/linux. On that page, you will find a basic overview, links to more Linux-specific information (including FAQ and forum pages), and a Picasa tour.
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