It was later updated to a white box that you type the answer in to. If you look at the symbols you will notice that they are not all different, but each one is repeated many times (some more than others). This probably led you to believe that they stand for letters, and they do. To solve it, you can either cheat or use a pencil and paper (I estimate 3 sheets). Once you have solved the cryptogram, what to type into the box will become apparent.