Totally new at this I have a theme but want to change it

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I had chosen a theme, debut and worked on it, a newbie here don;t I started working on another one and I want to replace it I went with Brooklyn but all the instructions I see on line have failed. Also is it ok to have a slideshow as a header, does it look ok? the store name is ccthefashionstore, but I thought I had it renamed as ccthefashionyorkiestore, please help, tks