Hello Susan,
Begin by visiting Components > RokGallery in your Joomla! administrator. Next, upload your images to RokGallery and publish them. Then, depending on what preset you are using in the template, add the appropriate tag to your images (in my case I am using preset1. If you're using preset2, add the preset2 tag and so on):
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Your image should then display in the slide show. As for the snowboard pics, you can simply delete them or remove their tags.
Hope this helps!