LOOP 1 is line 1, LOOP 2 is line 2
!SET LOOP 1
'the macro starts with the 1st line of your datasource file'
!SET LOOP 33
'the macro starts with the 33rd line of your datasource file'
also when you play a macro in loop, pay attention that you type the correct number into the loop counter box or else it won't loop correctly, if you have 50 lines in your datasource file and want to loop through the whole file starting from 1 to 50, then SET !LOOP1 and put 50 in the loop counter box, if you want to start from the 15th line and loop until the 36th line, then SET !LOOP 15 and put 36 in the loop counter box