Removing certain buttons or menu items

I am looking to remove buttons like task & notes from the Contact list and then the Phone button from the actual message window.

I admit I am still learning A LOT about this, but there is really no good documentation on how one might want to remove a certain button from the chat window. In other programs, toolbar customization is usually included in the preferences or easily access via a right click on the taskbar.

Spark provides for neither of these options.

Can anyone point me in the right direction here?

Thanks

Jen