To create a MultiTouchPanel widget choose "Widgets > Panels > MultiTouchPanel". The mouse cursor changes to a crosshair icon, indicating the create mode. With a left-click anywhere on the empty main background window you add the selected widget to the current page. Left-click again if you like to add one more. To quit the create mode, you can switch to the run mode with [F8], where you can use all widgets. Most widgets however need to be set up first.
To set up the properties of the MultiTouch Panel simply right-click in the GUI and choose the menu entry "Item Properties", press [ALT+P] whilst the mouse is hovering above it or double-click on it when being in the edit / move mode ([F9]). The MultiTouch Dialog opens up. Don’t worry if this takes a bit longer than opening the Item Properties of other controls.