I moved your post over to the CSS Form Builder forum as a new thread so that it would not be as confusing when replying.
If you have updated the insert page with a new form and are just not getting the insert to occur anymore you will probably just need to update the insert server behavior to work with these new form fields.
To do this you just need to double click on the insert server behavior that is in the server behaviors tab. On here go to the next screen where you associate the values with the columns in the table. Just select a column, then for the value use the lightning bolt icon to select the corresponding form field from your newly modified form.
This is all that is needed, once the columns have been associated with the new fields in the form it should work like it used to.