On the firm profile screen there is a drop down for Address Type on the Information tab. To add to this drop down or modify existing entries, take the following steps:

• Application Administration | Misc. Settings 
• Category Headings 
• In the drop down on the bottom right, select [19] Address Types 
• Click List 
• Proceed with adding/removing/modifying as desired 
• Click Save for each new type or change made