Need help with new pattern please

Really need help with this pattern please i have done the first 18 rows but now it says i have to keep continuity of the pattern but dont understand where it says to start with 1st and 3rd row… does this mean i miss out the 2nd row and do to the end of the 18th row and then carry on as normal or do i always miss out the 2nd row?

Welcome to the forum!
There are two pattern sequences here, the moss stitch which is a 4 row repeat and the cable pattern which is an 18 row repeat. You’ve just finished a row 2 of the moss pattern so you’re next row is row 3. Then the moss pattern will continue with rows 4, 1,2,3,4 etc.
You’ve also completed row 18 of the cable pattern so the next row is row 1 and that pattern continues with row 2,3,4,5,6 etc.
Don’t skip any rows, just keep a table of the 2 pattern repeats side by side and check them off as you work.