Make thumbnails post in a page

Hello,

It’s really urgent I finish this website. I need to put 6 posts (images) in a page. They should look small size in the page (thumbnails images) and when you click on the image possibly they should open in another page in a really big size. Basically these images are press pages so It’s important they are big and readable when you open them. Here the link: http://saramorinidesign.com/nightofthestarslondon/press/

I also downloaded the plugin for re-size the thumbnails but doesn’t work. can you please help me? Thank you!!