If you are just getting started with WordPress, the following videos and documents will help to guide you on how to edit your website:
How To: Add a Page - http://help.edublogs.org/writing-pages/
How To: Add a Post - http://help.edublogs.org/writing-your-first-post/
How To: Menus - http://help.edublogs.org/custom-menu/
How To: Upload Images - http://help.edublogs.org/add-images/
How To: Upload Documents (no video) - http://help.edublogs.org/upload-documents/
How To: Use the Block Editor - https://campuspress.com/a-guide-to-the-wordpress-block-editor-for-student-bloggers/