Computer question - help needed please?

Are they all in the one folder in Picasa or in separate folders? If just one it is going to be easier. What I would do firstly is create a new folder (on the desktop for convenience) right button of mouse down to new and up to folder and just call it photos for the time being. Now from Picasa, click on the folder or folders in turn that contain the photos, use CtrlA on the keyboard to highlight all photos in the folder, then CtrlC to copy and paste them (CtrlV or right button of mouse paste) into the folder you have created on the desktop. Repeat this for each folder of photos in Picasa.

Once you have all the photos in your new folder (and you havent moved them, just copied), then put your CD into the drive, then right button on the folder, send to, navigate to the CD drive and copy them over to the CD. You will get prompts so can't go wrong.

right click on cd open explore this stops the disk going into auto run and copy and paste to a selected folder, works on ubuntu,