How to show DICOM and the corresponding RT STRUCTURE?

Hello everyone, I’m a newbie to Slicer.

I have one DICOM directory where many .dcm files are there and another DICOM RT STRUCTURE directory where one .dcm file is there. I want to load the two directories into Slicer and shown in 3-D view.

I have tried to set the Options into “Scalar Overlay”, but it didn’t work. How could I do next? Thanks a lot!