Keyboard not connecting
I have a Yamaha Portable Grand DGX-300. I have it connected to my computer and it is not connecting. I went to the gear icon and the MIDI is enabled. I went to Preferences, Audio & MIDI, MIDI input & output has an arrow with "no device" or "USB MIDI interface". I click on the USB.... and the field goes blank. Can anyone help me know what to do so I can use my keyboard with this program? Thanks in advance!