Hoe do i synchronize the flash on my camera with a Metz 44 flash and a Nikon D40?

The flash itself works perfectly but it won't synchronize with my shutter!

If you look on page 34 to 36 of your user manual, your options using flash are discussed there

The maximum shutter speed without some manipulation is 1/200th second.

It is recommended that you use flash with the camera in the manual mode for the most control