MS Word for Mac has trouble reading level 3 and 4 headings. This video tutorial demonstrates how to solve this problem so H3 and H4 appear correctly in your table of contents.
General Formatting Rules
Font: The preferred APA font is a serif typeface such as Times New Roman with 12-point size.
Spacing and margins: Double-space between all lines of text, including the reference list. Have uniform margins of 1 inch (2.54 cm) on all sides.
Title page: Components include page number, paper title, author(s), author affiliation (school attended), course number and name, instructor’s name and title, and due date.