Login to Bongo4U Admin Mode. Go to the page on which you want to make changes by clicking on that page's link in the navigation.
Once you are on the correct page, find the block that you wish to move and hover your mouse over the "Block" menu link located just above that block. The Block Menu will appear.
Hover over the "Move" option on the Block Menu and a sub-menu will appear. Select the appropriate option from the sub-menu: