Please fill in your www and your specs (You have been a member long enough to know this is needed for support)
If you are unable to move the blocks it could be a result of the theme you are using. Which we do not know because you have not filled in your
WWW. Also this question has been answered multiple times, using search would have given you the answer.
Inspite of this here is the answer:
In the default theme, from blocks admin, to drag the block name in the 'tree' structure to where you want it placed.
If you can not see this structure it may be a result of your theme.
This first screen shot is the default theme the second screen shot is another theme (XtremeThemes) as you can see this theme does not have the tree.
1)You can either ask the theme creator to update the theme, or ask them to show you how,
2)or you can change temporarily to the default theme, make your changes, then activate the theme which is not compliant.