On the top right of your newtab page click the small paintbrush icon. This will open up the background preferences where you can pick from a number of pre-selected background images or colors.
To the left of the search box you will see a drop down menu which will allow you to select either Yahoo, Bing, or Google as your search engine. You can enter this menu and choose a different engine to search from any time.
On the top right of your newtab page, click the cloud icon to see the weather and the clock icon to see the time.
On the top left of the page you can select Web, Images, or Videos. The default is Web but clicking on any other section will allow you to search specifically in these categories.
To change the engine you URL bar searches from you simply need to change the engine the same way you did in FAQ #2.
Click on the Chrome Menu icon to open the menu
Click on Settings
On the left window pane click on Extensions
Choose the Search Manager extension from the list
Click on the Trash bin icon to the right of the extension
On the pop up window click on the Remove button