Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
I think you should consult with your template provider and see whether that is possible to change the component position on the page, because some of the template can allow user to set the position which position they want to assign to.
Regarding with your second question, it seems like you other page also display white colour, you can check my attached screenshot below, the background colour should controlled by template.
If you referring the component inside the background colour is controlled by the Easyblog (
http://take.ms/ysQV7), we did have a dark theme for Easyblog but this theme only available for the developer license.
However, i can suggest you switch your theme to elegant and click edit the elegant link (
http://take.ms/wEJsS) , you can set your background colour and the rest of the single part colour.