Everybody has the ability to astral project. In fact, we do it more often than we realise - we just fail to be conscious of it. The technique below on how to astral project is nothing more than getting over and past the mental block of unconsciousness and will help you significantly to astral project.
The technique includes having you and a second person agree to meet in a certain place and spot in your dreams. To ensure this works, both of you need to think a lot about the place you want to meet at, right as you are going to sleep.
As long as you are together when you see each other in the dream, you will have the same dreams. Some people call this 'dream walking' however, this method is not a dream, you are actually in the astral realm. After a few times, you will be able to do this without having to fall asleep. (Remember both of you will need to be asleep in the same time) Good luck :)