just use windows for copying and pasting it in your project directory.
The directory to place it in is the following:
Just paste the needed file there, be sure to refresh your project. The R file will now update himself and you will be able to call the image with. R.drawable.<name>
You can also paste the file in eclipse, same directory
You don't need the .jpg for calling the file. For example:
image.jpg will be called with R.drawable.image