setting up marketpress

tfbc
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i purchased a 3 month subscription and downloaded marketpress. I have it setup with multisite as i want to have a site like etsy, but some things are not really clear, im trying to basically make my site look like http://wp-ecommerce.org/ where then i can edit the header. but i want the same style as it shows here, to list products in a grid, pick a store drop down at the top of the page, etc..

how do i edit the marketplace (index page) to show what i want, like using the shortcodes, widgets and what not, as of right now it says:
Welcome to the MarketPress parent theme. Please use a child theme to get the styling you require. Any child themes can be found under themes/.
FrameMarket is the parent theme for our MarketPress themes. It allows us to offer a range of themes all using the one core. You also can then use that core to create your own child themes and hit the ground running with creating a MarketPress theme.
Current styles: GridMarket

and its only showing a single column of the products from my store items, i want it to be like your demo with 3-4 products per row.

I want gridmarket to be what every1 sees at http://www.domain.com
and want another theme which can be seen when viewing my own shop

as it stands, when i goto my stores dashboard and select a different theme, its changing the main sites theme.

i have the following plugins installed
marketpress with gridmarket theme
buddy press
pro sites
affiliate

your site says there are different payment gateways like paypal chaining, authorize.net, money bookers, yet i only see eway shared payments and paypal express

appreciate the help