It depends on the legend you want to move. Titles are fixed as they are, but you can turn those off and replace with Text In Chart (on the Presentation tab). In the settings here you can specify an Angle (degrees) which will twist the text round.
On some charts the legends can be made to run along the axis by ticking the Label Along Axis checkbox on the Axis tab of the properties.
With regards to further placement please see this post: