There is a drag/drop tool to enable you to move addresses up and down in priority, on the Management page.
Tapping the icon in the top-left corner will open a new, draggable list.
Tap/hold the address you want to move, after a short-time it will highlight with a small shadow. Continue holding and drag the item to a new position in the list.
When you have finished repositioning the addresses, tap the Save button, which will update the numbering of the pointers in the Manage list and on the Map view. Whichever address is positioned at the top of the list will be number one, and re-coloured red.