Help for a newbie

Hello!

I need a little help understanding my first pattern, it reads

Sleeves
Cast on 58 - yep, got that
Work in rib as for back for 6 rows - yep, got that
dec 1 st at end of last row and ending RS - yep, got that too

This is where I get lost!
Beg with K row, work in st st, shaping sides by 1 st at each end of 3rd and 2 foll 4th rows then on foll 6th row, 67 sts

Any simple advice would really be appreciated :aww:

At this point you’re working knit one row, purl one row for stockinette. You’ll increase in the first and last stitches as you go:

3rd row
7th row
11th row
17th row
23rd row