Sleeve help!!

I need help reading my pattern. Here’s what it says:
Work 12 rows of bell rib patt 2(3:3:4) times, then work in patt for 6(6,0,6) more rows, and at the same time inc 1 st at each end of every 10th row 40(38,42,42)sts

I’m not when I am supposed to start doing the increases. Any help would be appreciated! Thanks!

Welcome to KH!
Probably from the beginning of the bell rib pattern. What pattern are you working? Can you give us a link or a pattern name?

It’s called bell ribbed sweater. Its from a book called lullaby knits

Count 10 rows starting from the beginning of the bell rib pattern. Very nice looking sweater.

Thanks so much! My first sweater for my boy. I’ve messed up so many times! Almost done