Once you are at the website, download the file to your computer, connect the camera to your computer, copy the file to the SD card in the camera. (it should show up as a drive once you connect the camera). Once it's on the SD card in the camera, go to the setting menus on the camera, tab down to the firmware setting, and load the new version.
It will shut down on its own, then start up with the new version.
It will take away the jitters that you are experiencing.
"Flags and Handlebars Should Never Touch the Ground"