Page Width bbpress forum help

Hi, I wonderd if you could help. I am trying to make the forum on my website wider as it looks cramped at the moment. I thought as I am paying for a subscription here I would give your support a go so I hope it works out. The forum in question is
http://forumite.co.uk/?post_type=forum

As you can see the site is being built and used at the same time.
Look foward to your responce.
Lee