I notice a lot of posts where someone wants to respond to a previous post, but simply ends up going on the end of the reply list without actually bringing their post to the attention of the person they are responding too....Phew, that was a bit long winded!!!
When you want to respond, hit 'reply' to the post you want to respond to, and first click the @ symbol and a drop down box will appear with a couple of previous post alternatives in that conversation stream...one of which will be the post you want to respond too.
For all the seasoned forum users this is all 'old hat' but it took me a few days to work it out.....and I don't think I am dumb!!!! although others I know may have a contrary opinion...Cheers...Rob