Best Answer eric , 13 May 2015 - 10:26 PM
Unfortunately full theme customization is not yet available for Wix users, so for the moment what you're describing is not possible. You're "stuck" with the theme choices that you can see on the full options page for TubePress.
However please know that this is very high on our development priorities for Wix and we expect to have this capability in the near future.
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