Images how to move them left and right and change sizes

Hi i have written an article on my site as an example but i have noticed on the demo that they can alter the image sizes and they can move the image to have the content left, right or above the article.

Can anyone please let me know how to do this please

Here is the example of what i have done where the image is to big

http://www.in2town.co.uk/index.php/2011 ... eight-loss