It's preferable to access ZModeler3 forum with the following url:
This is the same forum as "forum.zmodeler2.com" but uses slightly different design and runs on another domain. You can login with your current forum credentials. Topics posted on this forum (if they have attached images or files) might not appear properly on zmodeler2 forum.
ZModeler3 General Disucssion forums
You can gain access to this set of subforums when you create ZModeler3 account and attach your forum username to your account. The guide is here: http://forum.zmodeler3.com/viewtopic.php?f=21&t=5672
Until then, you are in read only mode on these forums.