The board outline is on every layer while you are in PCB123, but when we output the gerber data you have the board outline on a layer of its own. There is also a copy of the board outline on the paste, drill drawing, and assembly layers.
The buttons along the right side do not allow you to add information. The buttons near the top, on the right (Selection Toolbar), allow you to toggle the ability to select object. The next tool bar (Layers toolbar) on the right allows you to select the active layer. This in conjunction with the appropriate tool allows you to add information to your layout. The last tool bar (Zoom Toolbar) on the right provides zoom and grid options.
The two inactive button on the Layers tool bar are for functionality that has not yet been implemented. The P is for paste and the B I believe is for bottom paste. Please feel free to contact customer support if you have any questions.
Software Support Engineer I
13626 S. Freeman Road
Mulino, OR 97042
Phone: 503-829-9108 x226