I'm not sure I understand which page you're referring to or the types of changes you want to make.
In general, post pages can't be changed. You can customize the registration forms and your public page. On other pages, you can define and edit content, but not change the layout or what data is displayed.
I don't know if that answered your question. If you provide more details, I may be able to offer more help.
What I wanted to add on the page where the children check in is a column that we can record that they paid for a tee shirt. So we could distribute tee shirts and check in kids at the same time.
Thanks for the additional information. It helps us to know how people want to use this tool.
Right now, there is no way to change what is shown on that page. On that screen, you are only two clicks away from the full details for an individual student--click the student, and then click edit. (We're working on enhancing the student information page to include all the details there, so eventually you'll only be one click away.)
For now, it may be easiest to download the the student data and print out a spreadsheet for use at the sign-in table
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