To move items around on the map, click on a map room entry and drag it around with the mouse. Note that when you move an item up and down, all other items in the same map row entry move vertically with it. All items in a map row entry are tied together so that they must all appear on the same row. Also note that you can not drag map room entries past each other in the same map row entry. In the current version of Editroid, this limitation is imposed for technical reasons.
To edit the items in a screen, click a map room entry. The screen you clicked will be displayed on the bottom. Two boxes appear on the right. The top box lists all of the items in the screen (although there is only one item in most screens) and the bottom box lists options for the selected item. There are different kinds of items: elevators, palette swaps, power-ups, and even doors and enemies. In the current version of Editroid, you can not change item data from one type to another.
There is also a checkbox labeled "Update password data." When this is checked, the ROM's password data is updated to reflect changes made to item data. This allows you to move and change power-ups and still have the password system work properly. If you prefer to manage password data yourself through the Password Data Editor, uncheck this box.