Values should be moved forward by 1 (behind the just inserted value).
Example: Original array {1,2, 3, 4, 5}. Insert 7 at index 2, the the array becomes:
{1, 2, 7, 3, 4, 5}.
The element 3 originally is at index 2; now it's at 3. So it's been moved forward by 1.