Hi Dude,
You can use the action "Array Set" to change the values in your array directly if you know the index.
If you have an array of gameobjects, their position should be automatically updated in the array without you needing to change anything. As you are referencing the gameobject, it will store information about its position, scale, rotation etc. You can then use the action "Array Get" to get whatever info you want from that gameobject.
But if you just wanted to edit something in an array directly you can, its like an override feature though.
Is this what you are after?