Yes, Reply only adds to the bottom of the thread. This is perfect when responding to the last post or if adding to the discussion.
If you need to refer to a specific post, hit Quote. Then the trick is to edit the resulting quote to delete all the stuff you are not replying to. This keeps things tidier.
If you want to respond to multiple posts, click on Quote for the first one, make sure the cursor is in the reply box, and then click on Quote for the next post. Multiple quotes will then appear in the reply box.
This software works a bit different than typical and we are all adjusting to it.
BTW, I am currently listening to 2L’s Mozart: Violin Concertos - Marianne Thorsen, TrondheimSolistene on the DS. Magnificent sound! The violin is particularly gorgeous. Excellent performance, too.