To Catch SHSH Blobs, you have to Download TinyUmbrella from the list of links on the right at thefirmwareumbrella.blogspot.com. After that, Double-click the downloaded program and follow the onscreen instructions to install TinyUmbrella on your computer. Then, start TinyUmbrella. Next, plug your iPod, iPhone or iPad into the computer using the supplied data cable. Forth, Click the name of your device and click the "Save SHSH" button on the right side of the screen.