Pattern confusing

I am at row 10 on the decrease row but I dont understand the instructions how to go forward. Please help. Thanks arlene

Welcome to the forum!
The decreases after row 10 are on every 4th row until 114sts remain. That’s decreases on row 11,15,19,23,27 and so on until 114sts are left. On rows 13,25 and 37 make a buttonhole.
The directions for the buttonhole include a m1 which may be defined somewhere in the pattern but it seems to me that in order to have an opening, you’d need to work a yarn over in place of the m1.