you cant. you can push a blank IT policy to the device but that is it. The reason people are so upset by this software is because it was intended for a very specific audience. It is just like BPS/BES but scaled down for a family/small business to use. Just like every other piece of server like software it is bound to have security on it (after all, BBs are the most secure devices on the market). Downloading/Installing software without proper documentation (ie software you were not supposed to have) is asking for trouble.

to clear the restrictions in the IT policy, backup your PIM data (synchronize to outlook) and then wipe the device. follow JCs post in the RIM software forum for removing the IT policy. you will not be able to disable the firewall and other services may be disabled as well, but you should get your browser back