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How to customize the theme on a wikia wiki
Go to your wiki's home page.
It can be accessed by the url for your wiki, if you remember what it is.
Go to your admin dashboard.
This is where you'll find the page where you can make your custom theme, and it can be accessed at Look for the " theme designer " button and click on it. Clicking on that button will take you to the page where you can design your theme.