You can go to TeamSideline.com and register at any time without an invite. To get access to a specific team, a staff member (manager, coach, assistant coach, team parent, or site coordinator) will need to put you on the roster with your email address. Alternatively, your wife can accept the invite and then add you to her Family & Friends list. This will give you access to her teams. These processes are in place to limit team information to the general public.