Beginning with the main oyster widget, click on "Calibrate", then "Visibility", then "Triple", then "ManualUnwrap". Instructions on how to place a box over the data which needs to be (un)wrapped appear as follows:

Place one box by clicking left mouse button to anchor
a corner of the box. Click middle to fix size and to
move box around. Click left button to set the box.
Click right button to cancel/reset and return!