FLC TUNES WRONG VOR IN ORDER TO RECEIVE DME INFO. NAV ERROR OCCURS.

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WE DEPARTED RWY 32R FROM SEOUL; KOREA (KIMPO INTL) ON THE GOLF DEP (ENCLOSED). THE CAPT AND I HAD ANYANG VOR (115.1) SET WITH 120 DEGS IN THE WINDOW. SHORTLY AFTER TKOF WE REALIZED WE WEREN'T RECEIVING DME; SO WE BOTH SWITCHED OVER TO KIP VOR (113.6) TO GET DME FOR 5 DME OR 2300 FT TURN. WE FORGOT TO SWITCH BACK TO 115.1. AFTER TURN TO 220 DEGS HDG WE JOINED THE KIP 300 DEG RADIAL INSTEAD OF SEL 300 DEG RADIAL. WE WENT SLIGHTLY THROUGH THE KIP 300 DEG RADIAL TO THE S AND PICKED UP ABOUT A 100 DEG HDG TO REJOIN. THIS PUT US ON A HDG TOWARD RK (P) 73A AND B. AT THE TIME THE CREW WAS DISCUSSING WHY THE RADIAL WAS JOINED SO QUICKLY AND SENSED ALL WAS NOT NORMAL. THE CTLR CAME ON AND ISSUED US A TURN TO 180 DEGS IMMEDIATELY. WE COMPLIED AND WHILE WE WERE IN THE TURN; HE REISSUED A TURN TO 240 DEGS. IT WAS AT THIS POINT WE BOTH REALIZED WHAT WE HAD DONE. WE WERE THEN GIVEN DIRECT ANYANG ON COURSE. WE NEVER CAME NEAR P 73A AND B AS WE WERE ALWAYS W OF THE ARPT BUT OUR EASTERLY HDG GOT THE CTLR VERY EXCITED. THE REMAINDER OF THE FLT WAS UNEVENTFUL. AS A FOOTNOTE; THIS WAS DAY 2 OF A 5 DAY TRIP. ON THE FIRST DAY WE FLEW FROM EWR-NRT. WE LAID OVER IN NIT FOR APPROX 25 HRS. ON THE SECOND DAY WE WENT NIT- SEL-NRT. WE LEFT NIT AT APPROX XX00 LCL WHICH IS OY00 'BODY' TIME. THIS IS BACK SIDE OF THE CLOCK FLYING. I'VE FLOWN A LOT OF TRIPS LIKE THIS ONE AND THE SECOND DAY ALWAYS SEEMS TO BE THE MOST DIFFICULT.