How to link background to URL

How do I link the background image to a URL?
(Example: http://navi-gaming.com/en)

Also, is there a way to place more images besides the logo with clickable URLs (and also the mouseover effects on top of the images/logo)?
(Example: the same website navi website but check the sponsors they have besides their Logo –
Example #2: http://www.fnatic.com/)

Is there a way you guys can help me out with my website? If I’m asking for too much customization how much would you charge for helping me make some tweaks?

http://dash9gaming.net/