Need info on B & K scope

I just got a B & K 1470 scope via ebay. It has a probe and it seems to work ok. I connected the probe to a channel input and get response when I touch the probe. But the probe has only one connection. The scope has a second input marked ground but I do not have a way to connect to this input. I presume I need to connect to this input and to the probe if I want to check a voltage. Where can I get the correct connector for this input? Alternatively, can I just make my own?

Would appreciate comments.