Best answer as chosen by user 8string: Sorry but the steps change with the setups.
Did you check if the router's WiFi channel is one your Samsung can use?
Is the router within 20 feet for the first setup?
Why does the channel matter? Read http://forums.cnet.com/7723-13973_102-560420/wifi-disconnects-from-time-to-time-galaxy-tab-7-plus/?tag=contentBody;threadListing
You bring up a good point. Should these products have more integration and not rely on folk learning about networks and WiFi channels?