Not sure what you mean by continually add – you can just make more posts, but if you mean a forum like this site, it uses BuddyPress:
http://wordpress.org/extend/plugins/bbpress/
There are other options as well – these are two:
http://wordpress.org/extend/plugins/vanilla-forums/
http://wordpress.org/extend/plugins/mingle-forum/
Thread Starter
deebest63
(@deebest63verizonnet)
I meant if I wanted to add stories under my blog “Mom and Alzheimer’s” as sort of a journal or diary (to keep people posted) do I have to hit reply or keep posting them separately which would defeat the purpose.