You can add, edit or remove options from a limited number of drop downs within Rapport. To do this you can do the following:
Click on the edit button on the tab the dropdown is located, click on the dropdown and select EDIT...
Here you can edit the name of the current options by clicking on the name, remove an option by pressing the red cross or change the position of the options by using the arrows.
Once the changes have been made, click on the save icon at the bottom of the list.
If the EDIT... option isn't available for the dropdown you want to change, let me know.