The image you received is called the dock image. Unfortunately, I'm not personally familiar with it, PurpleAlien (Johan) will be best to answer how to go about adding another user. I'll point him to this thread when I'm done posting. As to logging out and back in, that *should* work from the power button in the dock. Alternatively, I believe the dock (it's called cairo dock) has another log out/log in button.
As to the dragging things around, you can "double tap" on the trackpad to grab and move things (you tap once and then tap again this time keeping your finger on the trackpad), or alternatively, if it's a window you're trying to move, you can hold down the alt button while using the left button.
It seems during our recent server move that some of the images have gotten corrupted, so we're working on restoring them. The other option is to download an image, and write it to an sdcard and install it (maverick is the one most people use) and this will allow you to go through the initial setup of your own user, but you will not get the "dock" interface, it will be a standard gnome interface.
Steev Klimaszewski, Genesi USA Inc.
Senior Software Engineer