How to Verify a Site in Google Webmaster Tools
This is such a useful tool (I did a video of it here) that I would recommend anyone who's serious about their website to use it.
So here's a quick video on how to add a site and verify it using the 'upload an HTML file' method. This is ideal for verifying WordPress sites:
If you have any questions by all means get in touch - I'd be delighted to help.