Regarding your issues with our support, I would rather address them in a ticket that you currently have open with me. The answer to your question regarding disabling the ability of anonymous users to post is also in the reponse I provided in your ticket but here it is again:
To restrict posting to members only, go to the control panel>> Forum Settings>> under the Forum Permissions tab you will see the Group Access option, you will want to make sure that For the Guests group that Read Only is checked. Note that you will have to do this for each forum.
Regards,
Denise Fitzgerald
Customer Support Manager
Infopop Corporation