You should then set the delay time to 4 steps at a length of 8 and then move the original sample on the timeline backwards about 1/2 a bar (so that the sample plays at the correct time).
a good thing to do to get melodies to match in samples is to get a pitch delay effect and set the feedback to 0% (so there is only one echo) and the Level to 100% (so that it is only the single echo and not the the single echo AND the original input).