How can i install support library android?

I need to work with the android-support-v4, buy when i try to install it from SDK manager (support library), it does not show me the package, actually i wanted to install another API level, but i can not either, because the sdk manager does not show me any other API than the ones i have already installed. Here is an image of the SDK manager: How can i show everything i need? (i already tryied with the obsolete option).