This is custom code and not a default out of the box BP user account screen, if you have no coding experience it will be hard for you to accomplish, that said this is likely built using their cbox framework which may handle some of this type of custom screen layout?:
http://commonsinabox.org/.
To achieve a screen like that requires a compliment of coding tasks, creating a custom home page screen, adding specific PHP functionality to that and then styling it up, it’s not a beginners task.
Is it simple CSS No! CSS is not simple 😉
