You can change the order that fields appear in the entry editor. This has no other effect on the stored data or on any view.
To move a field up or down on the entry editor:
Click the name of the field you want to move to open its menu.
Move your mouse over Move to reveal the submenu.
Click Down or Up to move the field one position lower or higher respectively. The field will change places with the one before or after it. Alternatively, move your mouse over After and choose from the submenu one of the fields you want this field to appear after.