Did you get your four rows of the 1 x 1 rib done yet?
If not that will be
Row 1 will be K P K P K P K P K P… for all 72 stitches (assuming are you doing the adult small size, otherwise do the whole row that way for whatever size you’re doing).
Row 2 you will do the opposite, P K P K P K P K P K allllllllll the way across.
Row 3, just like row 1
Row 4, just like row 2
Now you’re ready to start your K4 P1 pattern (you can start your row count over since you’re done with the first section, it will be easier to keep track how many you have done)
Row 1 - K3 P1, then repeat (K4 P1) all the way across to your last 3 stitches which you will knit
Row 2 - You will be purling the stitches that you had knit on row 5, and knitting the stitches you had purled on row 5, so since you ended with K3, you will start with P3, then you will (K1 P4) all the way across to the last four stitches (which were the first four of row 5, so you will K1, P3
Row 3 - same as row 1
Row 4 - same as row 2
Repeat for the amount of rows specified in the size you are using, then you’ll start your decrease section. Follow those directions, and on the even rows (you can start your row count over again). On the even rows, (2, 4, and 6) you will continue in pattern like you had been, knitting the knits and purling the purls. By this time it will be easy to tell what you need to do to keep the ribbing pattern going.
Hope that helps! Just let us know if yoiu have more questions!