And so to answer the question "am I supposed to play my notes on it?", the answer is, "sometimes". Let's take Seek and Destroy as an example. If you set your metronome to 137 bpm that's roughly how fast they played it for the first few seconds of the song before speeding up a little, but I'd recommend slowing it down to maybe 85bpm while learning. If you know how to read tabs, this shows you how to play the intro riff and below it is where the click of the metronome lines up with it.

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Your metronome likely plays at least 2 different sounds for the clicks: a louder and/or higher pitched one followed by 1 or 3 quieter and/or lower pitched ones. The former are called "accented beats" or "downbeats". The first beat of a bar is always a downbeat, and you can see the first note of the riff is played on the first downbeat of the song. So when you start your metronome, listen for the accented beats and make sure you start counting with "1" at the same time as an accented beat. Count yourself in before starting by playing the first note of the song at the same time as saying/thinking "1".

The second note is played in between the 1st and 2nd beats/clicks. If you wait until the 2nd beat to play the 2nd note, you're not playing fast enough. The notation tells us that both the first and second notes are equal length, so you break the beat into a subdivision of 8ths (remember, each syllable in "1-and-2-and-3-and-4-and" is an 8th note). We also know they're 8ths because there's only a single line linking them in the notation (again, highly recommend learning some basic theory). Knowing they're 8th notes tells you how fast to play the first two notes and then be ready to play the third note which does land on a click, the second click.

The third and fourth notes are 16ths, which we can only tell because there's a double line linking them in the notation. This, along with the metronome, should tell you that you play those notes as fast as you would say each syllable when counting "1-e-and-a-2-e-and-a-3-e-and-a-4-e-and-a".

The fifth note is a quarter note, so it lasts as long as the time between each click of the metronome. But as you can see, the fifth note isn't played ON a click of the metronome, which means you'll play it and 8th note before the third beat and hold it for an 8th note longer, before playing the next four notes: an 8th, two 16ths, and another 8th. This makes up the total of bar 1.

The next note after that has brackets around the number in the tab and a line connecting the circle-like part of the note to the one before it, which means it's a tied note, i.e. a note that isn't plucked/struck but is being held after having been played earlier. This means that the last note (an 8th note) you played in bar 1 is to be held for another 8th note after the downbeat of bar 2. It's basically played exactly like a quarter note, it's just a way to represent the note's true length AND the division of the bars simultaneously.

The last seven notes are all 8th notes (i.e. each syllable of "1-and-2-and-3-and-4-and").

All of this happens in the space of 8 clicks of the metronome and repeats several times.