Right off the bat, there are two ways you could do this:
1. To locate other families registered on the site bearing those names, go to Community > Family Sites > Site Center, and run a search based on surname (http://www.myheritage.com/research).
2. To run a more in-depth genealogy search, go to Genealogy > Research > New Research and use the genealogical search function (http://www.myheritage.com/research).
Hopefully that helps. Any further problems, don't hesitate to get in touch.