Since you're talking about 'clicking host', I'm a bit confused. The fact that you are talking about clicking likely means you're using Windows instead of Linux (note that for hosting, Linux would likely be the better alternative, even more so since the Linux Dream Demon is completely command line based and thus automatising tasks becomes very easy).
DreamDeamon doesn't provide a 'Host' button you could click though, only one named 'Go', but the default DreamSeeker skin comes with a 'Host' button.
Could you get a bit more precise as what set-up you intend to use?