Answer for change bg color for post and tag

Hello,
How do I get to put a header image underneath the nav bar on the home page? Please refer to http://www.kashmikamal.com for example of the header image that I want to use. Also, how do I get rid of the name of the Category on the header from each page? Example- http://kksfavthings.com/category/skin-care/ . I do not want “Category- Skincare” to appear at the top.
Thanks,
Kashmi
http://www.kksfavthings.com