Remove drop down menu

Hello,
I am using Brasserie and had a friend of a friend help with some web design, since I know relatively nothing about it. I’ve just checked the work that was done and he added in a drop down menu, which I cannot for the life of me figure out how to get rid of. I just thought it looked cleaner with the original menu bar across the top. How do I change it back? I don’t know how to read coding to delete it. Any help is appreciated!