Go to F10 ingame and check the dive button and the torp button. The torp button is the button some make your bombers drop the bombs.

The dive button makes your dbs too dive, to get them to dive just press that button (mine is assigned to M) and then left click on the map where I want them to dive.

That mostly it.

Manual dive bomb button + left click will place the circle and your bombers will group tight as they get close. Obviously there is more to it then that so play around with it.

Ok i will try explain better:

There are 2 bottons on Dive Bombers:

- The Dive bombing botton: once you press it you must click with left mouse where you want begin the DIVE, your plains will change speed and get close to each other to reach the point that you marked at the same time (you can cancel the Dive Bombing just clicking with rigth mause botton)

- Torp bomber botton, when they are diving you must press this botton to throw the bombs, cause on manual bombing rigth click is not allowed to bomb.

thanks alot guys :)