To edit your application simply click on the "Add/Edit New Student Application" box, on the upper right side. This will allow you to make changes to personal information, and more.
Some schools will allow parents to apply for different schools at the same time. You'll see the map and a list of schools arranged by distance according to your account's zip code. You can also arrange them by name. Here you'll be able to choose from the list all the schools you wish to apply.
Even some schools will give you the option to rank the list of schools you are applying for, from the most wanted (#1) to the least. After completing all the steps, make sure to confirm the application information and "Submit."