How to thread tapestry needle for crochet?

I am trying to teach myself to crochet. I have 2 edges that I need to attach together. I know this sounds stupid, but how do you thread the yarn needle to sew the pieces together? In all the videos I've watched, they just put the yarn through and don't knot it or anything. And then it magically holds the... show more I am trying to teach myself to crochet. I have 2 edges that I need to attach together. I know this sounds stupid, but how do you thread the yarn needle to sew the pieces together? In all the videos I've watched, they just put the yarn through and don't knot it or anything. And then it magically holds the pieces together. I don't understand! I just want to sew the pieces together with yarn and a yarn needle but I don't even know how to start by threading the needle! I have no experience with this whatsoever!
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