most bobbles I have worked go about by increasing into one stitch when you are in a right side row. Once you made e.g. 4 stitches out of that one, you turn your work, and work back over those stitches in knit or purl as instructed (smooth or bumpy bobble surface). you work back and forth a few times, maybe, then you consolidate all those stitches into 1 again, contracting the bobble and go back to work your row.
Some bobbles do the entire increase in one "mini-row" and the same with the decrease. Others build up and come down spaced out over the rows of back and forth.
Maybe that helped already? If not: what does your instruction demand of you?