1. Not sure why you can’t verify Bing/Yahoo, try this plugin:
2. The headers are already setup properly, the reason you’re getting multiple h1s is because you’re adding additional ones to your posts, like:
This is redundant. If you need to add further headers in the post content, start with h2.
3. The theme is already SEO-friendly, but for further control, like setting meta descriptions, you’ll want to setup one of the following plugins: