The top green row is for adding new pages.
The type of page added depends on the drop down at the left. Question is the default.
PSeq defaults to adding at the end of the current page list. You can change it to a lower number to insert a question in an existing list.
To delete a question you own from an existing list, tick the check box in the most left column and click on the Del link that is next to the SAVE button.
The SAVE button saves changes that you have made to the fields for existing questions.