Citing an online journal is similar to citing a print journal, with a few exceptions:  Include website title. Specify "web" instead of "print." Include date website was accessed. In practice, the above structure should lend itself to a citation that looks like this: Last, First M. "Article Title" Journal Title Series Volume. Issue (Year Published): Page(s). Website Title. Web. Date Month Year Accessed.

Summary:
Follow the basic style of MLA formatting in online journals. Make it look like this.