If you (or your children) are the member of an organization that is using PushSave for a fundraiser and the fundraiser is tracking purchases to the member level, you need to join the fundraiser.
You should have been given the link to register in an email, text or flyer. These are not public links because we don't want to confuse the user that is just coming to Buy a Book.
If you go to the organization page and than add "/register" to the end of the link this will take you where you need to go.
Here is a link to the list of active organizations, click on your organization and then add "/register to the url in the address bar of your browser.
If you already joined a fundraiser, you click on the "My Fundraisers" tab on the menu to promote the fundraiser or to see how your sales are going.