How to connect DDJ-200 with rekordbox on MACBOOK Air

With a USB cable.

there is only one port in DDJ from which i have connected my mac with ddj. Still unable to connect rekordbox.

Are you using rekordbox in performance mode? Which version of rekordbox are you using?

Ver. 5.8.3

And are you in performance mode?

yup

Do you see the DDJ-200 listed as a control device at the bottom of the page in Preferences > Audio?

Yes now i can. How will the controller work now?

DDJ 200 is mentioned in control device information in Audio settings

In Performance mode, the 200 isn't controlling anything but plugged in right?

@Syed > Can you please open the Audio MIDI Settings application and open the MIDI Studio window and tell me if you see the DDJ-200 displayed there in a solid colour:

If not, please disconnect the USB cable, then click the drop-down (on my window shown as "Pioneer DJ" and click the New Configuration... option, then create a new configuration and give it any name you want. Reconnect the DDJ-200 and see if it is then displayed solid as above.