Help Ive gotten a little stuck

[lolanice19]

Hi all I've gotten a little stuck on my pattern. I'm currently knitting an aron cardigan and working on the back there are 8 rows to this. have now reached RAGLAN ARMHOLES which says:

Keeping the pattern correct cast off 4 stitches at the beg of next 2 rows

what does it mean by keep the pattern right do I miss the first 4 stiches of the pattern seen as though they have been cast off?

Please help

Thankyou

[lolanice19]

You know what I think ive wrked it out for myself! I cast off according to the stitch, eg. cast off a knit, cast off a purl?