If the types of edits you need to make are not possible by using the "edit citations" command or by modifying the output style, they you may want to remove the field codes. In doing so, the  citations and the bibliography will become plain text that you can edit yourself. This should be done only when you are finished working with the EndNote document, as removing the field codes also removes the link between EndNote and Word, and adding or removing any citations after removing the field codes will not update your bibliography. Be sure to make a backup copy of your document, and then if you have Word 2007 or later, go to the EndNote tab an choose "convert citations and bibliography", then "convert to plain text".

If you need additional direction, here is the link to online assistance for EndNote:

http://endnote.com/support/search-knowledgebase