Hi and welcome to Knitting Help!
The instructions are a bit ambiguous. I'd go with
"Work 32 rows decreasing 1 st at neck edge in 5th and every foll 6th row."
You'd do the decreases while working the next 32 rows.
So you would decrease on row 5 and then rows 11,17, 23, and 29.
Can you give us a link to the pattern or a pattern name?