Snapshot Theme (WooThemes) Customization help...

Hello friends,

I'm planning to use Woo Snapshot theme for my website but there are some problems which I couldn't fix.
I would like to have 3 items showing in a row instead of 2 on the main page. And I want to resize them into 220x150 on the mainpage and categories page in 3 rows, but on the second (post) page, want to keep the original size 330x190

Another problem; When you click on the thumbnail, it takes you to the post image page. Then you can further click on the image and it links to the original full sized version of the image. It is this link that I want to remove.
Basically, when you go to the post page, I want to remove the link to the original picture because it takes you out of the main site.
How can I do this?

And the last question; I want to publish a 468x60 ads in the header part on the right and side, where the site description is. There's already an option to write there something but it doesn't work with ads banner link.

If somebody could help me about these 3 problems, I'd really be appreciate. Please help...