Now click on the line you've just created, and a pop up will allow you to select FF=Finish-Finish, SS=Start-Start, FS=Finish-Start or SF=Start-Finish these are the types of dependencies. Drag the chain icon/line to the task 'Test Operation'. In the Gantt chart, left-click-hold on the task 'Install Device', a chain icon will appear with a line attached to it. Go to Tasks> click the Gantt chart button.
You can create a dependency in ProjectLibre in at least two ways: As the gentleman states, you must first tell the program the order of your tasks, or Predecessor/Successor. i.e.: In order to Start 'Test Operation' you must first Finish 'Install Device'. Your question involves a typical Finish>Start Dependency, or what Projectlibre calls 'Predecessor/Successor'.
