7h3C47

Completely new to this world, looking to set up my first ever hifi system this weekend. Two hopefully-simple questions regarding the RP-600M speakers I purchased: 1) It's not clear to me how the banana plugs connect to the input terminals on the back of the speakers. I can unscrew a threaded plastic nut to reveal the hole where you would insert the loose copper wire, but from videos I've watched online it looks like banana plugs are inserted straight into a hole almost like a headphone jack. There is a plastic dome in the center of the nut which is presumably covering the place where a banana plug would be inserted. Is that a 'cap' of sorts which is removable to reveal the hole into which a banana plug would be inserted? I haven't picked at the nut or that center piece as I don't want to accidentally break anything. 2) The speakers have dual input terminals. Am I required to run both sets of cables to my amplifier in order for the speakers to work? I think the amp I selected only has one +/- input for each of the left and right stereo speakers; if both input terminals are required to use the speakers, do I need to find an amp that accepts two sets of cables per left and right stereo speaker? Thank you!