Want to hook RCA 2 prong cable to genie mini C61-100 box. What adapter do I need and where do I connect it on the box

We're sending you a DM, so our specialist can assist. Rhyan, DIRECTV Community Team

It looks like you'd need a cable like this one

https://www.amazon.com/Computer-Accessories-COMPOSITE-CLIENT-10PINCOMPOS/dp/B01HWH6OMG

that gives you stereo RCA plugs.

Back of box says A/V. That is the A/V 10-pin to the 3 individual prongs for Audio and Video.

Since you say 2 prong, I take it you have an old TV or monitor that is mono audio only.