Students must join the classroom by following the link https://classroom.google.com/u/0/c/MTIyNDc0NjI1MTU3?cjc=gb2l27c , but also parents can join the classroom too. You would have to register twice, once with student log in then again with parent’s email.
If you are in my class for the 2018/2019 school year, I have already sent out invitations to join my google classroom. Within my google classroom, you will find posts that allow you to join some of the educational websites I will be using this year. I have already created assessments and assignments if you want to get a jumpstart on fourth grade. Looking forward to having an excellent year.