Customizing - other Textboxcolor - bigger image

how and where I can customizing the slideshow? you write "Customizable 100% via Plugin Parameters / CSS / HTML"... where and how I can I do that? und where I can resizable the image? I need it bigger like now. I need it like www.immobilien-carus.com . And I want change the textbox-size and text-box-color

Dear

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