Which version you are using.
Which options you see when you visit the page Space Administration >Space Theme, you can configure the space theme from there and add space footer etc. I will suggest a good plugin to make you comfertable in doing these things https://www.adaptavist.com/display/Plugins/Packs. this is my personal opinion so its upto you to use or not. Read all the documentations before going for it.
You can refer the URL and get some idea http://confluence.atlassian.com/display/CONF35/Creating+Your+Knowledge+Base+Space
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