To edit an existing lab you will need to first open the Lab Manger window by clicking the “Tools” menu option and selecting the “Lab Manager…” menu option.
Once the Lab Manger window is open you will see a listing of all available labs on the left hand side of the window. To open a lab for editing simply single left click on the lab desired and it will display on the right hand side of the window for you to make any changes you desire.