All NHA students need to have a student account on Schoology.com. Parents may also create a parent account. Once students have enrolled in a course, parents may request a student code from the instructor and use it to link their students' accounts to a single parent account. This is most helpful for parents of multiple students who need to see what's going on in all their children's accounts without remembering everyone's individual passwords. If you only have one student, it's easiest to just log in as your student to see how things are going.
Here's a quick video that should help you get started in Schoology. The class code for the NHA Orientation course is DMMP-XQMB-PPWPJ