It looks like your turntable is fitted with an Orotofon OM3 cartridge which is a MM level cart and your amplifier has a "Phono" input, but MAY need a phono card fitting. Easiest way is to connect the leads from the turntable to the Phono - in connectors on the amplifier and see if you get any music through your headphones at normal levels. If you do, sorted - if you don't you will either need the additional Denon phono card OR a basic outboard MM phono stage. You would then connect your turntable to that phono stage and then that phono stage into any input of your main amplifier.
Good luck !!!