Excel Message Boxes?

If you are talking about microsof excel, its pretty simple. if you only want part of the text in the box a certain way, highlight the text you want to change to, oh, lets say italic and red? well, then after you highlighed it, up on the toolbars, it should have an icon for text color. Then for italics, you'd either press ctrl+i or look for the italic on on the tool bar. for bold, press ctrl+b. for underline, press ctrl+u. hope this helped!