When you get there you should see your icon in the top right-hand corner.
Mine is Groot..

I am assuming you are logged into a Google or Gmail account.
Now click onto the +

Now when you go to https://classroom.google.com, you will have a new class you can enter.

This class is very much a self-learning class, with your ability to ask us questions, for us to answer them and maybe you will find other people that have already asked your question and someone else has also answered it.

If you have problems and solve them, give us an outline of how you fixed them. Let us help each other.