How to modify Nutritional Facts?

abigailm83

I'm trying to figure out how to modify the nutritional fact for what I ate for lunch. I had a Guacamole & Red Peppers Ribeye from Schlotzky's but I had it put in a wrap instead of eating it on the Jalapeño Cheese bun. I have found it and all the facts in the data base but I don't know how to go about figuring and changing the difference between the wrap and the bun. Any suggestions??