How to Edit Resource File?

I'm trying to create a menu bar in a window I've already created using Visual Studio 2008. I created the resource file (.rc), but cannot figure out how to edit it. I know I need to put the 'symbols' (numbers) with the #defines in the header file. What do I put in the rc file? Or better yet, how do I enter the info in? If I were simply writing the code I'd do something like this:

Mainmenu MENU BLAH
{
POPUP "File"
{
MENUITEM "Open", MENU_FILE_ID_OPEN
}
}

Not sure how to put this info into the format that the .rc in the resource viewer in VC++. This is probably a simple answer. Thanks.