1. You can just click quote and delete the text you don't want to appear in your quote.
2. On the bottom left of this thread you'll see a "move link" which can be used to move a topic. Alternatively, if you forget you can ask on your thread how to move it or report the thread and as a mod to move it.
He already answered all of your questions, if you want to quote someone's reply, just do what he had said, just choose the highlights of his post and you may remove some supporting details. Just choose the specific line that you want to quote.
We also have here what we called the multi quoting, which happens when you reply on a certain topic then find other posts or reply and quote it, copy the whole text and then paste it on your first reply. You shouldn't submit your first post wait for your second quote and then you have to include it to your first post and then submit it.
Good advise, I have visited that thread once before and that is really helpful for me. OP you should have time to read it so you will have any ideas on how to make well posts.