Howdy @Oreo - Everyone has a different method for importing/exporting photos. The easiest method would be to plug your memory card into a card reader. Most modern computers now-a-days come with a built-in reader.
Once plugged into a card reader, you could open up Picasa and import the photos from the memory card.
After the images are on your hard drive, you could then plug in your thumb drive and copy/paste the images you want to move over. Picasa also has an export option, which would allow you to export your newly imported photos to a folder on your thumb drive.
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Once plugged into a card reader, you could open up Picasa and import the photos from the memory card.
After the images are on your hard drive, you could then plug in your thumb drive and copy/paste the images you want to move over. Picasa also has an export option, which would allow you to export your newly imported photos to a folder on your thumb drive.
Hope that helps and happy shooting! :)