If you are using the girlythingsbows instructions, http://www.girlythingsbows.com/loopy_bows.html
After the 6th step where you wrap the wire around (I usually use thread and a needle), at this point you will add some extra's. You cut your piece of ribbon twice the size of the loops. Fold it in half and put it in next v side down. Wrap it with the wire or use your thread and needle. You really need to go up through the middle of the ribbon or it will slip. Add at least 3 or 4 pieces side by side across the barrette, then move on to the next step with another loop of ribbon. Keep repeating these steps adding extras between each of the loops until you get to the end of the barrette. When you're done cut some of your loops so you have more spikes. Hopefully, that explains it better.