1. You should be using your friends account then so we can check their subscription - support requires a subscription.
2. Use this code....page img {
max-width: 100%;
}
This is how to create a custom CSS compatible with Gantry 4...
http://docs.gantry.org/gantry4/tutorials/adding-a-custom-stylesheet
That makes the image the same width as everything else in the post - i.e. it is the whole post that has the padding not the image within it.
Regards, Mark.