The phono inputs on receivers that have them boost a turntable's signal, which is too weak to drive an amplifier's line-level input on its own. In this case, the receiver has a built-in preamplifier that increases the turntable's signal to useful levels. You can, however, use a receiver without phono inputs by connecting an external phono preamplifier between the turntable and the receiver.
Turn power off to your receiver, turntable and preamp.
Connect the two output audio cables coming from the turntable to the preamp's inputs.
Connect two cables to the preamp's outputs, one cable to each output. Connect the other end of these cables to the receiver's line-level inputs. The receiver inputs may be marked "Line," "Aux" or "Tape." Switch the receiver's input-select knob to this setting when you use the turntable.
Connect the turntable's ground wire to the grounding post on the preamplifier.
Turn power on to your receiver, turntable and preamp.