I want to send an email out to all of our team parents inviting them to use this website but when I did a test run for one parent, they were able to go in and alter the roster and make changes to everything. Is that normal?

Only staff members should be able to edit the roster and events. Staff members include managers, coaches, assistant coaches, team parents, and site coordinators. Parents and players should not be able to edit the roster or events.  Double check and make sure that this parent is not setup as a staff member.