B767 CREW IS SWITCHED FROM RWY 6L TO RWY 7R AT LAX BUT IS UNABLE TO FIND ILS RWY 7R IN THEIR FMC DATABASE. DURING THE SCRAMBLE TO GET SET UP FOR RWY 7R THE CREW FORGETS TO CALL THE TWR AND LANDS WITHOUT CLRNC.

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ON DESCENT WE WERE INITIALLY CLRED ILS RWY 6L. AT ABOUT 6000 FT AGL AND 20 MILES; APCH CLRED US FOR RWY 7R. NO ILS IN DATABASE; SO WE SELECTED RWY 7R. APCH THEN TOLD US TO CONTACT TOWER AT FUMBL; WHICH IS FAF FOR ILS RWY 7R; WHICH WASN'T IN BOX. I DIDN'T HEAR FREQ DUE TO TASK SATURATION; AND ASKED FO WHAT FREQ THEY GAVE US; THEN LOOKED AT COMMERCIAL CHART AND ASKED IF THEY HAD SAID 121.75. FO SAID I THINK SO; BUT HE WAS BUSY SETTING UP FOR APCH WITH NO AIDS. I DID NOT CONFIRM; AND THEN WENT BACK TO BOX TO GIVE FO FAF INFO. I ENTERED FUMBL IN FIX PAGE. BECAUSE OF RWY CONSTRUCTION; I WENT TO ATIS AND WAS REVIEWING TXWY CLOSURES. BECAUSE OF DISTRACTION OF LATE CHANGE OF RWY; NO DATABASE APCH REQUIRING MANUAL CONSTRUCTION; NO PAPI LIT EVEN THOUGH PAPI ON APCH PLATE; I FAILED TO CHECK IN WITH TOWER AND RECEIVE LNDG CLRNC. FIRST CLUE I MESSED UP WAS ON ROLL OUT AND NOTICED WE WERE ALREADY ON GROUND FREQ.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STILL HAD NO IDEA WHY THEY WERE UNABLE TO SELECT RWY 7R ILS IN THE FMC.SUPPLEMENTAL INFO FROM ACN 738095: APCH BRIEFING WAS COMPLETED AT TOP OF DSCNT FOR AN ILS APCH TO RWY 6L. AT APPROX 20 MILES FROM THE FIELD; THE CTLR SWITCHED US TO RWY 7R. THE ILS FOR LAX RWY 7R WAS NOT IN THE DATABASE DUE TO RWY CONSTRUCTION I PRESUME AND NO VISUAL GLIDEPATH GUIDANCE WAS AVAILABLE FOR THIS RWY SO THE CAPT WAS INPUTTING THE RWY TO INCREASE MY SITUATIONAL AWARENESS FOR THE VISUAL APCH. THE APCH CTLR INSTRUCTED US TO CONTACT TOWER AND THE CAPT CONFIRMED THE FREQUENCY WITH ME. THERE WAS ALSO A QUESTION OF TXWY CLOSURES WHICH THE CAPT WAS HURRIEDLY TRYING TO DETERMINE SO WE COULD BRIEF THE RWY EXIT PLAN. THE ACFT WAS FULLY CONFIGURED AND ON SPEED AT APPROX FIVE MILES AND 1600 FT MSL. THE FINAL DSCNT CHECKLIST; 1000 FT; AND 500 FT CALLS WERE ALL MADE IN ACCORDANCE WITH SOP. AFTER LNDG; THE CAPT TOOK THE ACFT AT 60 KTS AND I QUERIED THE CTLR TO CONFIRM THE TXWY WAS OPEN. THE CTLR INFORMED ME I WAS TALKING TO LAX GROUND AND TO EXIT AT THE END. AT THIS TIME; I REALIZED WE MAY HAVE NOT CONTACTED LAX TOWER AND RECEIVED LNDG CLRNC. THE CAPT AGREED THAT THIS MAY IN FACT BE THE CASE. OTHER FACTORS INCLUDE MY RELATIVE INEXPERIENCE ON THE B767. THIS WAS ONLY MY SECOND LNDG IN THE B767 IN THE PAST TWO MONTHS AND WAS A RELATIVELY DIFFICULT NIGHT VISUAL APCH WITHOUT ELECTRONIC OR VISUAL GLIDEPATH GUIDANCE.