Academic Writer contains a Writing section where you can create and write a full APA-formatted paper.  You can write the entire paper in Academic Writer or just use it to setup the title page, headings, and references.  Export your work at any time to a Microsoft Word document.  Below are documents from Academic Writer about the essential features of their Writing tools.  

To start a paper:

• Click the Write a New Paper button.
• Select a template to follow.  Most students will want to use the Basic Paper.
• It should be the default, but make sure the Student Assignment option is selected.  If it is, click Submit.
• Enter the title of your paper, then click Start Writing.

At this point, you're now in Academic Writer's writing tools.  It will looks similar to tools in Microsoft Word, but with extra APA Style-focused features like adding references, tables, and figures.  

The Writing Center's tools are easy to use, but they are deep and there many options and features.  APA has provided several videos and documents illustrating the different parts of the Writing Center.