Odd I just checked it again it has little circles and you just click the one by the letter it’s down on the right hand side bottom. Otherwise only thing I can think of is if your browser is set somehow not to allow it but I’m not that bright about computer things so???
Are negative grades allowed? Well, I give him an “i”, which is the square root of -1. LOL.
Are you using Internet Explorer or Mozilla?
Never mind. I got it...gave him an F. Too bad there is nothing lower....
In HTML, those “little circles” are called “radio buttons” (like on the old fashioned car radios), and, like the old ones, only one can be “pushed” at a time...