To add a custom field:

• Login using an account that has 'Administrator' privileges.
• Click Settings on the top-right, and select Customize Accompa from the menu.
• In the resulting page, click the desired Add New Field link - and follow on-screen instructions to add the custom field.

When you visit the Add Requirement page (or similar page for appropriate object) after adding a custom field, you will see the newly added custom field.