Can students, parents, coaches, or any members add themselves to the system?

Yes. You can use a Registration Page that your prospective members can visit to enter their own information and add themselves to your club. Training videos 2.2 and 6.3 talk about how you can set up a Registration Page for this purpose by going to Webmaster and scrolling down to the last blank page at lower right and selecting Add New (not “+ Add News”) > Registration Page.