Hello everyone!

I'm a PMP aspirant and just started preparing and want to get PMP in my first attempt. I found this excellent site 

while I was searching for sources for PMP. I hope I'm going to need all of your help and guidance. I have couple of  questions to start with:

1. How to navigate to the older posts of the forums? I don't see next, previous links. Yesterday I saw couple of topics that I can't see them today. I'm sorry if I miss something in the navigation of the forum. 

2. I have PMBOK 4th edition guide downloaded in 2010. Is there a latest updated version available? Or is it enough to read the old edition itself ?  I'll be renewing my PMI membership soon and meanwhile I want to study with my old edition. Is it fine?

3. I have Rita 7th edition downloaded yesterday. Is this the latest edition?

Thanks for every one for your upcoming guidance and helps!

Jai