Numerical Integration is over my head!

Working hard on my abstract because it is due by the end of the week. I hope it will be good enough. Im getting frustrated with numerical integration! Caitlin taught me how to integrate on paper and I understand what I am looking for in the end and sorta what I am integrating but I don't know how to do it in excel. For now I have my abstract to work on and then the poster but I need to talk to Dr. Dube because im just not getting it and it really sucks feeling like im not getting done what I should be.