Continuing the discussion from The Society's Community "How To" Guides:
Jumping back to the homepage is straightforward. In many cases, all you need to do is click on the heading, “The Society’s Community” in the top left of the screen (in the header of the page next to The Wine Society logo).
If you scroll down in a conversation, you will notice that the header will change. Instead of showing the normal header, the site will show the title of the conversation you are reading for reference. In this case a house icon will also appear on the top left. Click this icon to return to the homepage.