How to measure the analog signal of RT-BOX which is input into the launchpad at the same time?

I know maybe this question may does not belong to the range of plecs/RT-BOX, I don’t have a launchpad interface which enables the oscilloscope to measure the signal input into the launchpad at the same time, so dear specialist, do you have some good ideas about this? Currently ,I can only measure the signal from the metal parts of Dupont Line, I almost want to cry.Can anyone help me?

I have solved the problem by using the very cheap Jumper cap.