beg with a 2nd row , work 1 row in rib as given for back
1st row (right side) rib 104 st, turn ( rib does it mean k2,p2 etc)
* Use whatever the given ribbing pattern was for the back. So if it was k2p2 rib then yes, use this.
From here on when it says rib you should k2p2 being sure to always knit the knits and purl the purls. Beware, as you are turning the work in the middle of your rows you may start on the second knit or purl doing a k1p2 or p1k2 before resuming the k2p2 pattern.
* This means slip 1. Since you are not told otherwise, assume this is slip 1 knitwise. This means you should insert your right needle into the left loop as if to knit, but don't. Simply move the loop from your left needle to the right. Proceed from there.
FYI: Sometimes you will be told to slip purlwise.
* This is a yarn over. It is a form of stitch increase. Basically, you wrap your working yarn around your right needle creating a new loop on the right needle. Then you proceed to the next direction in the pattern. The only tricky part is to make sure you have set yourself up for the next stitch correctly (yarn now in front or back) and that your YO does not fall off your right needle before doing so. Check this link.