C152 WHILE PRACTICING ASR APCH AT MYR LANDS AFTER BEING TOLD TO EXECUTE A MISSED APCH.

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(BEFORE STARTING ASR; RADIO DID NOT RECEIVE 2 CALLS BUT SEEMED OK AFTER.) CFI AND STUDENT INBOUND ON ASR APCH. FIRST ASR FOR STUDENT. CTLR GIVES MDA AND MISSED APCH INSTRUCTIONS WITH MISSED APCH POINT. CTLR IS ONE-ON-ONE WITH ACFT; SO NO READBACK. ALSO GIVES THE PLT THE AFTER COMPLETION INSTRUCTIONS. CFI TELLS STUDENT TO WRITE THEM DOWN BECAUSE ELSE HE WOULD FORGET THEM. STUDENT WRITES DOWN THE WRONG THING. 3 SM FROM RWY; CFI TELLS CTLR ARPT IN SIGHT AND BEFORE THIS WAS RPTED THE CTLR TOLD STUDENT AND CFI TO GO MISSED AT MISSED APCH POINT. GETS THE CLRNC TO LAND AND/OR TOUCH-AND-GO. CFI AND STUDENT KEEP ON DSNDING TO MDA FOR PRACTICE AND CFI GETS DISTR BY STUDENT WHICH IS ASKING HIM IF HE HAS TO GO DOWN AND LAND AND TAKE SOME FLAPS. WHILE ATC IS TALKING; CFI IS NOT SURE WHAT TO DO AND OF COURSE YOU SHOULD ASK ATC FOR CLARIFICATION; BUT SOMEHOW YOU DON'T DO IT. STUDENT AND CFI GO DOWN AND LAND AND SEE ANOTHER PLANE AHEAD OF THEM CLOSE TO THE GND (PROBABLY TAKING OFF). AFTER TKOF; WE (STUDENT AND CFI) TURN UP TO OUR ('ASSIGNED') HDG AND WE WERE TOLD TO CALL UP THE TWR AFTER WE WOULD TOUCH DOWN IN CONWAY. I (CFI) WAS TOLD THAT I DID NOT GO MISSED APCH WHEN I WAS TOLD TO AND I TOLD THE MYRTLE BEACH SUPVR THAT I WAS NOT SURE ABOUT WHAT WE WERE SUPPOSED TO DO AND MY REGRETS. ONE THING IS FOR SURE -- ALWAYS ASK ATC IF YOU'RE NOT SURE WHAT TO DO! DON'T LET ANYTHING COME IN BTWN.