yes, it's hidden
yeah, they kind of messed up on the interface there.
right click on the person's name that you want to webcam with and click 'view webcam'.
i don't see the option to do it anywhere else in the gui, so i assume that's the only place.
they should make it more like the actual yahoo IM and have a 'view webcam' button directly on the IM window, or on the menu bar of the IM window. that would be more intuitive
hope this helps
PS - don't forget to install jasper first before you install ayttm if you wan't webcam support