here is how to zip a file.
1. create a new folder.. you know how to do that on your computer right? if you don't.. just go to your desktop-right click-new-new folder and then minimize that folder to a smaller size so that you can drag in pics from the other folder.
2. go to your picture folder and make the folder smaller like your new folder and then just drag pics from that folder to the new folder.
3. after you've got all the pics in the new folder then just highlight all the pics and then right click and hit add to archive. that should create a zipped file for you.
4. go to yousendit.com and upload that zipped file.
there you go.