To add a corner between the first helper and second helper:

1. Press F3 or F4 and select the point on the edge where you want to add a corner.
2. Move the architect to the new point that you created.
3. Press F6.

To stretch a corner using the first helper:

1. Press F3 or F4 and move the first helper to the corner that you want to stretch.
2. Move the architect to the point where you want to stretch the first helper.
3. Press F5.

To delete a corner using the first helper:

1. Press F3 or F4 and move the first helper to the corner that you want to delete.
2. Press Ctrl + Backspace.

To stretch an edge:

1. Press F3 or F4 and make the edge that you want to stretch as current.
2. Place the architect at the point to which you want to stretch the edge to.
3. Press Shift + F5

To extrude an edge:

1. Press F3 or F4 and make the edge that you want to extrude as the current object.
2. Move the architect to the point where you want to extrude the edge to.
3. Press Shift + F6.

To edit an object, you can stretch the corner with the first helper using the mouse.

To rotate an object, you can rotate the corner with the second helper using the mouse.