HumanMMouse(640, 220, 15, 15);
640: the x coordinate where to click.
HumanMMouse(640, 220, 15, 15);
220: the y coordinate where to click
HumanMMouse(640, 220, 15, 15);
15: the amount of pixels it may be off on the x-axis. So somewhere between 640 - 15 and 640 + 15 it will click
HumanMMouse(640, 220, 15, 15);
15: Same as with the previous parameter, but on the y - axis
Wait(RandomRange(625, 900));
625: The minimum amount of time the script will wait.
Wait(RandomRange(625, 900));
900: The maximum amount of time the script will wait.
You might think why we use these randoms, that is because a human will not wait exactly 800 ms every time and won't click on the same pixel every time.
edit:
super ninja'd. Had the tab waiting to long.