Here are the steps to customize the order sections (i.e. Relationships, Discussion Threads, Subscriber List, etc.) are displayed on the record detail page.

• Login using an account that has 'Administrator' privileges.
• Click Settings on the top-right, and select Customize Accompa from the menu.
• In the "Customize Record Detail Pages" section, click the "Customize display..." link for the object you'd like to customize.
• On the resulting page, click-and-drag the sections to re-order them.
• Click the Save button once you're done to save your changes.