Can anyone give advices or anything I have this menu and i want the background to blur. Here`s a sample
Depth Of Field image effect. http://docs.unity3d.com/es/current/Manual/script-DepthOfFieldScatter.html
To expand on that, you'll want to import the "Image Effects" package via Assets -> Import. More on that here. Once you've imported it, select your camera and click Add Component -> Image Effects -> Camera - you should find Depth of Field there.
And, I may as well include this. You need either Unity 4.x pro or Unity 5 Personal/Professional to be able to access image effects. I see you have personal, but thought I'd mention regardless.
Try the solutions posted here: link. As a side note - that was the first link that popped up when I typed "unity standard assets missing" into Google. If you refine your web searching technique you'll probably find answers to little questions like this much more quickly than you will waiting for people to reply here. Not that there's anything wrong with asking here - it just might save you some time is all