If you're a member, you can change the current place by selecting a place from the 'My places' list in the sidebar.
E.g. if you were reading the forum for Wimbledon, and you change the current place to Putney, the website will display the forum for Putney.
If you're a guest, then to change the current place, type a postcode or neighbourhood name in the sidebar's guest login box. The website will then show you all the the streets, neighbourhoods and blocks of flats nearby, and the place you then choose will become the current place.
Why not register now? It's free, and only takes a few seconds.