Effect Return and Send on Amps

I got my Bassman 400 Pro combo last year and its only until now that I’ve gotten an effect (the murf) that I can run through the Effects loop. How exactly do I set this up?

Do I put the send cable into the Audio in on the Murf and the Return in the Left audio out…then plug my bass into the main input jack on my amp?

cheers

Yes, that’s how you hook them up.