Is there a certain way I should put them on my arrow? Should they be vertical or horizontal?

I've read that if you shoot fingers you should align the blade parallel with the ground(horizontal) because there is less resistance with the side forces form a finger release. Vertical for a release since the forces tend to be more vertical with a mechanical release.

It doesn't matter as long as it is on the shaft straight.

Personally, I like to at least have the broadhead come off the bow at the same position. As far as which, I'm not sure it matters, but I line it up at about the 10:30, 4:30 position. That's just for safety reasons though.

I lined mine vertical last year and had no flight issues at all shooting a release.

I line mine up with the nocks, so that they run the same way as the string.

I like mine to be vertical. Supposedly there is no difference, but I swear mine flew better that way.

I have shot them in various configurations & have had no change in impact.

Doesn't make any differance at all.I put mine on vertically because that's just how I like to put 'em on.I tried them on differant positions just to see if there was any flight changes and they all hit where they were supposed to hit and they all flew great.

It really doesn't seem to matter, but I like to line them up so they are straight up and down. It just looks cooler!