Can you use Tamron macro lens for SLR on Nikon D3100?

I have the Tamron 572DN AF 70-300mm Macro lens and would like to get some more information if you can safely use it with Nikon D3100 DSLR. It looks like it doesn't auto focus and the image appears a little foggy when I take the picture on auto settings. Maybe you have an advice on the settings I should use? I just started my photo adventure and would like to gather some more information about my equipment.

If it's Nikon fit, it should be no problem - although without a motor, it won't autofocus on your D3100.

If it doesn't have the 4-5 little gold contacts on the mount, you'll have to manually focus it. You'll also have to manually set the aperture as long as the lens has the aperture ring with the f stop numbers (4, 5.6, 8, etc). You will also have to set the camera mode dial on M, which will let you change the shutter speed by rotating the little black adjusting ring.