Depends

If your question is related to the current
thread, yo do like you did and Use
New Reply after the last post in the thread.
Another way to respond to a POST is to
Quote at the bottom of THAT POST
If it is a New Topic (Thread)
1)be in the correct forum (viewing the list of threads): On the LEFT above the list is a
New Thread button <<<<<
Try and pick the best forum (as described at the top level (or sub Level on those that have them)
IMHO Avoid Quick reply. A regular (and Advanced

) offer more options and tools.
If you do figure out you posted in the wrong place, There is a list at the bottom of the current thread list of Moderators that can move your post OUT of where it is at. (I only can Mod Calibre and Sigil and CC, not here) or you can use the report this post button ((next to the Karma button) And request a move to xyz (those reports go to the Greenies Board level Mods). Forum Level mods lighten their load, so use us when you can