Hello. I saw your request and wanted to reply. Because you are an admin at the wiki, you can easily make those two changes yourself. To change the text that appears above the navigation menu area, first go to the theme designer. Click the Wordmark tab to the left and simply replace the text that appears under "Community name".
To change the background, click the Customize tab. First click the box under "graphic", and on the window that pops up, click the box marked "Don't use a background". Then click the box under "main", and on the window that pops up, click the black square at the bottom right.
Once the changes are made, click the "Save, I'm done" button to save the changes.
If you need help, feel free to leave me a message; you may also want to visit the forums or join us on Chat. You can also check the staff blog to keep up-to-date with the latest news and events around FANDOM.