I am new to SME. I just installed 5.5 and everything is working. Well at least my Internet connection is....

I have a few questions. I've been using ClarkConnect for about 8 months
(
www.clarkconnect.org ) and I really like using it but I thought I'd check out SME. When I got to grc.com with ClarkConnect it shows me as stealth. I can turn on or off services via my Windows browser. How When I visit grc.com with SME 5.5 it shows a few ports opened. How can I turn those ports off?
How do I install the Update System Panel so that I can install RPMs? I would like to have the ability to forward some ports from my SME box to my Windows XP box.
Where can I find information about SME's firewall protection?
I been reading the web site and I see SME 5.5 is up to Update 6. After I installed SME 5.5 I upgraded to Update 2. How do I get up to Update 6?
Thanks for your help.
Palani