The Secret here is to right click the picture, choose the layout tab and select "In Front Of Text" or "Behind Text" as Eric10 suggested. You can then move the picture to a precise position on the page.
The text box is also a good idea if your text is required to be off centre. Again, by right clicking the text box border and selecting format text box, layout tab etc you can locate the box anywhere. On the Colours and lines tab you can remove the border or choose a fancy one.
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