help

i cant figure out this ,, could someone help me with it.. thank you in advance

Sleeve:
Cast on 26 sts (including edge stitches).
Knit garter stitch for 28 rows. .Decrease 1 st on both sides in the 5th and the 7th rows. To shape arm hole line in the 29th row cast off 2 sts at the beginning of the row and 2 sts at the beginning of the 30th row, in the 31st row 1 st once on both sides.
Knit 20 rows. From the 49rd row cast off 2 sts at the beginning of the row and 2 sts at the beginning of the 50th row, and 1 st once in the 51th row on both sides to shape the head of the sleeve. Knit 2 more rows. Total 54 rows.
Cast off remaining stitches.