How to create a new field with dropdown list in Meetings?

Hi all

I'm trying to add more options under Meeting Type dropdown list in SugarCRM but looks like I can't add in any more options than "Sugar". So I decided to create a new field in SugarCRM with a customized dropdown list. I tried a few things in "Dropdown editor" and "Studio", but I can't seem to reflect them in the interface when I create a new meeting. Can anyone show me how to do that?

Thanks.

Song