It's ok, calm down! It's just sleeves.
Increase on rows 12, 24, 36, 48, 60, 72, 84.
Do a M1 increase in the space between the two edge stitches on each end of the sleeves. If you'd rather do the increases on the knit side, do them on row 11, 23, etc., it really won't matter.
You can find video of the M1 increase here.
See? You had it all along.