When an opposing player shoots the puck in your direction you should:
1. Freeze for a moment, thus screening your goalie
2. Scream in terror
3. Do what ever you have to to get the hell out of the way at the last second
4. Enjoy the respect of your fans, teammates, and coach
Sergei also drew this diagram to help you guys out.
Now there are many moves you can use when blocking shots, and different situations will call for different moves. Here are some of Sergei's favourite shot blocking poses.
So now you know how to block shots like an NHL pro. This is a very important part of hockey that doesn't get the same publicity that say goals and points will, but it can definitely earn you the respect of your teammates. But you won't make the NHL just sitting on your butt reading. Get out there and practise what you've learned! Good luck!