That might be a specific issue with the plug and not related to the theme itself. There is no code in the theme to change that. I would suggest getting in contact with the developer of the plugin.
I just reinstalled that plugin, went to the plugin configuration and changed a few tool bar items, then saved the configuration. It seemed to work when I edited a Post and checked the editing menu. Did you configure the plugin and save the changes? I have forgotten to do that in the past myself. If so, all I can suggest is to make sure you have the latest version of the plugin and WordPress. We are releasing an updated version of TravelBlogger as well to address some changes in WordPress 3.2, so look for a new update to your theme very soon as well. A notice will appear in your theme Dashboard when the update is available on our site. And it will shortly be available after that here on WordPress.org.