First, make sure that you have installed the plugin. It is included in the installation file, or you can download it from our website.
To export from CorelDRAW, just choose 'Send to SignCut' from the toolbar in order to export the active document to SignCut.
Keep in min that the icon in the toolbar has changed over the different versions of CorelDRAW.
Here is a picture of what the icon looks like in the previous versions of CorelDRAW.