You need to go to "my account" at the top bar and then "Affiliate Settings". Set up your account for all of the advertising networks.
After you create a new hub you can define your ad display settings for each hub.
Hubpages will then display ads automatically.
By looking at your hubs I think you need to work on them a little bit more and improve the content. Search around and you'll find many tips on how to write good hubs. Here is one of my favourites: http://hubpages.com/hub/How-I-got-my-hub-to-be-on-...
Are you getting any traffic to your hubs? Without traffic there is no money. You can check you traffic stats by going to "my account" at the top and then "Statistics".