You should open one Job at least in the Studio to display the Palette to the right of the design workspace and thus start the search.
From the Palette, you can search for all the Jobs that use the selected component. To do so:
In the Palette, right-click the component you want to look for and select Find Component in Jobs.
A progress indicator displays to show the percentage of the search operation that has been completed then the [Find a Job] dialog box displays listing all the Jobs that use the selected component.
From the list of Jobs, click the desired Job and then click OK to open it on the design workspace.