MLA Citation for a computer application?

In one my high school cles, we recently had to do a project that involved the use of Smell-O-Mints, a periodic table application on mac computers. My teacher has told us that we must include an MLA citation of this application in our bibliographies, but I cannot find the format for such a format anywhere. Does anyone know the proper format for citing an application such as Smell-O-Mints? Thank you so much!