Find the "Secure Site" link in the top-right. Click it, now you're using the secure version of the site.
It's not certain pages, the entire site works as http or https. But, it also doesn't force people to use the secure (https) version. I've noted some cases where forcing it isn't a great thing for certain rare cases (can hose people).
Depending on how you get to a url on the site, you can end up using the "non-secure" old http version of the site. For example, if I link a gametz page for you like so: http://gametz.com/user/bill.html
(not https!) then you click it, it will work as the non-secure site. Oh noes!
Well, if you notice that, just click that "Secure Site" link in the top right (all that does it add the 's' to the http).