These are gonna sound like some stupid answers, but it's how I tamed mine and it worked great. All of my Silkies, especially the roos, love to be handled and climb all over me when I go into their coop.
The first, of course, is to handle them a lot. Hold them, carry them around, and sit with them for lengthy amounts of times.
Secondly, talk to them quietly. They seem to like it and it calms them down. They'll learn your voice and if you speak calmly to them they will soon start being calm.
And the third, and weirdest, is...uh...cheese balls!!!!! Go to the dollar store, and get a bag of cheese balls or cheese puffs. They don't need a bunch of them of course as they aren't exactly healthy, but they LOVE them. Takes some cheeseballs to your flock and they'll be your best friend before you know it.
Of course the best is to raise them from chicks and handle them frequently, but I had gotten numerous Silkies as adults and these three things work nearly just as well.
Do you have a rooster> If so, focus on taming him. If you can get him tame, the hens will follow his example and copy what he does.