How the hell do you…

How the hell do you edit the image data that was entered when you upload photos. Also should there not be a upload mangement page? I want to be able to use this built in feature of wordpress to host a very simple gallery of my photos.

Also im using K2 as a base for my website and want to know how do I change the style for pages that are from linked images? Because as you can see from my photo page https://www.photogabble.co.uk/photography/ when you click on the photos thumbs it goes to the automatically created page, but doesnt have a back link and the photo on that page isnt centered nor is it the correct size…

Any help please?