Joomla Virtuemart Assistance Required - Very short Job

Hi Another freelancer updated our virtuemart site recently. But once I paid him, he did not complete the work. He stopped responding to emails and left a few tasks outstanding. They should be simple for someone with good virtuemart knowledge. Tasks are: 1. Replace the logo used on the site (at the top of the homepage etc) This should be simple, but I just can't see where the file is! 2. Display product dimensions on product pages. The information is in the catalog, its just not published. 3. Also, the orders are still not working as we want. The customer is not getting a confirmation order to tell them what they have bought until we go in and mark the order as “confirmed”. I want the customer to automatically get an email as soon as they order and pay via paypal checkout. There may be some further work once the above is completed. Please start any replies with the words "I've read it" to show that you have actually read the above requirements. Thanks David