Dec 1 at neck edge

hello, I am knitting the Christie poncho by marie wallin. I am at the shape neck area. I have decreased 1 st at neck edge for 4 rows ok but am a little unsure about the next line. it states=then on foll 3 alt rows. just not sure what to do up till now I have the required number of sts so far. thanks for any help

“foll 3 alt rows” = following three alternate rows, or every other row. So you’d do it on the right or wrong side only, three times for a total of six rows worked.