Login problems

I am a retired teacher and want to keep up my skills. As I’ve seen in the past several years of posts I am not the only one having login problems. Why is it so difficult? As smart as you are on the lessons (which you do very well) you ought to be equally smart on figuring out a simple, easy login process!!! It doesn’t do anyone any good to have great lessons you can’t get to. I got into the program when I signed up, then struggled and finally got in a second time only to find my scores had been erased. I’ve now found out that most my work is incomplete or late. That is due to not being able to get into the program. Please help or I will find some other way to keep up.