The web site from hell

Have you ever tried to use the US Postal Service web site for the second time? It has become the web site from hell. After several attempts to buy some stamps I gave up and contemplated going to the tallest building in Charleston, drinking a cup of hemlock, slicing my wrists and jumping off. Then I remembered I had to do my laundry.
I used the postal service web site some time ago to buy stamps. It was an easy task. Now, I wanted to buy some more. Since my first usage they have changed the criteria for passwords and even after they e-mailed me my old one and told me to use it their computer would not accept it. I tried to register as a new user but their computer rejected me because it already holds my name, address and, I suppose, date of my graduation from kindergarten.
It could be simple. Go to the site, select what you want, type in where to send the stamps, and tell them your credit card number. Why do they need everyone to register and to keep all this data on file until global warming destroys the planet? The postal service is not a secret nuclear military base.