I'm hesitant to even answer, not knowing your skill level. But understanding that you will probably have a use for an item you purchased, and use it one way or another, here's a primer...
Be careful! Never push your hand directly toward the rotating saw such that if the workpiece kicks back your momentum will carry your hand into the blade. Begin by raising the blade only a little above the table surface and run a pass with clean wood over it to get the feel of the resistance a stack of dado blades gives. Consider making a groove in two or more passes if you need to raise the blade more than 1/4" to cut it in a single pass. Use metal dado shims to adjust the precise width of cut. Tighten the stack in a balanced way, such that the carbide teeth are not in contact with one another. Stay away from wobble dado sets. Etc. Etc. Etc.
You may wish to have a look at this website, whose author has obviously given the subject considerable thought: http://www.newwoodworker.com/usngstkddados.html
Finally, be carefull. If you think a single saw blade can tear flesh, imagine what a 3/4" wide swath will do to your hand. Think about your setups. Use test pieces to get them right. Then pay attention while you run your dados. And try to avoid plunge cuts, especially on anything shorter than a couple of feet in length. When you can, use a miter jig in the slot to hold any work you have to pass cross-grain over the dado.
Be careful, feed smoothly, and hold your workpiece firmly against the fence while it passes over the blade.
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can you describe the part as ther ar dif types of dado blades.
tom
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