Ok, so Im learning Electric Funeral from Black Sabbath from a tab, and I think its at 66 bpm, so how am I suppose to use the metronome to this song? I basically need help learning how to use a metronome to all sorts of songs especially rock and metal.

Thank you
How about using an online metronome? Or if you already have one, just set it to 66 and off you go. The metronome will keep the beat for you as you play. By the way, 66 is just a tad faster than the second hand on a clock, which is an even 60bpm(beats per minute). Here's a super simple to use online metronome. Just click on the tempo number that corresponds with the song you are playing and get to it.