Posted: 09/08/2014 at 12:53
GG...........as I started this particular thread, it shows on the RH side of the list of my posts. I just bring it up and add a new message ( doesn't matter what you write), submit reply and it comes to the top of Latest Posts.
Otherwise I think you can just pop the thread title into the Search box and it should then appear and you can add a post as normal.
Sadly, that's about the limit of my techie knowledge as I'm still using a 3 year old laptop.