Seeing the pattern itself, and the missing hunk of instructions from the part causing you a problem, helps heaps.
You have 113 sts on the needle, and you're on the RS about to start shaping the neck. What you do is work in pattern across 50 sts, drop that yarn and attach a new yarn at that point. Use the new yarn to work 13 stitches (which you then place on a holder... you'll use them again later when knitting up the neckband) and then keep on using that yarn to work in pattern across the last 50 sts.
So you'll now have 50 sts on one side (with yarn dangling from that section), 13 sts on a holder, and 50 sts on the other side (these will also have a yarn dangling from them).
These are the two sides you are going to work on, using the separate yarns for each side and keeping them all on the one needle, with the stitches on the holder in the middle, just being ignored for now.
Turn your work (WS) and work in pattern across 50 sts and at the end of that set of 50 stitches, which is where the neck is, bind off the last 3 sts. Drop that yarn.
Pick up the yarn from the other set of 50 sts and bind off 3 sts (ie that's at the neck edge), then work to the end. So what you have done is bind off 3 sts at the neck edge for each side piece (leaving 47 stitches on each side).
Turn work to RS and work across, again binding off 3 sts at end of the first set of 47 and 3 sts at beginning of the second lot of 47. (44 sts on each side.)
Turn to WS and work across, binding off 2 sts at end of the first set of 44 and 2 sts at beginning of the second lot of 44. (42 sts on each side.)
RS - Repeat the above decrease. (40 sts)
WS - Repeat. (38 sts)
RS - Repeat (36 sts)
Turn to WS and work across, binding off 1 st at end of first set of 36 and 1 st at beginning of second set of 36. (35 sts)
RS - Repeat the above decrease. (34 sts)
No more decreasing. Just work on those 34 sts on each side, in pattern, till front measures same as back, up to the shoulders.
Then bind off the 34 sts on each side.