I realise my previous post was not that helpful... put your pinky and ring finger on the third fret first, then your middle finger on the second fret, then use your index finger to "bar" every string on the first fret. And push. I do remember when I first started learning guitar many moons ago that it was one of the chords that felt very unnatural, but with time and practise your hand with strengthen and it will begin to feel more natural and easy, as with any chord

But this bar chord formation that you initially use for F major is very handy because you can use it to create basically any major chord. Plus lowering the action of your guitar will make it easier for you too and get rid of that unpleasant buzz that you are probably experiencing.