Hey Morgan, and welcome. I'll have to check with an admin, but my guess as to why so little is customisable is due to the fact that you are not a member of COG.
Some of the forums are locked and only allow COG members to read them. That may be the reason for you not being able to access some parts.
As for not being able to post new threads, I can not tell you why that is. Again, it may have to do with your status.
Edit: I noticed you have not replied to the registration e-mail. I am sure this is the reason for many of your troubles.
Hope this helps to sme degree.
Good Samaritan [COG]