Positioning your tile before you drop it

Instructor, demonstrate the green line and green border.

When you drag a tile and hover at the edit screen, a green horizontal line will appear.

You can drag the line up and down the screen within the edit pane.

When the line is in the correct position, and the border on the tile is green, you can drop the tile.

(Don't drop a tile when its border is red.) 

When you drop the tile, it will produce a line of program code at the position of the green line.