The themes posted were for version 1.2.x and you're using 1.3.x, so unfortunately they can't be used. You can have someone help you make your own theme, or you can modify any of the themes that come with the installation.
To edit a page on your site, find the "admin center" link, go to content and click the gear to edit that page.
I believe some people can synchronize the gender/alt images, but I don't know how, sorry.
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