Updating row/item in collection

I successfully (after help pounters from Sam) created a form which can add members to my collection. I tried to duplicate the page, change the dataset link to read/write, and add next/previous buttons. The page works in that you can select it and use the next/previous buttons, but if you change the content and press submit, it doesn’t work . Any ideas?
https://www.png68.online/copy-of-class-member-input-form

Hi again Sandy,

Have you checked the permissions of the collection to see if they allow “update”?

Yes, I checked those and coould have been a problem, but I think my larger problem is the single dataset connection which appears on all the pages, so that when I change it on another it effects all the other pages. Ziv is checking that out which he thinks could be a bug.