Select/tick any image at top left click ALL in the middle at top click download, choose where and wait for them to download, may take a while as very high res.
To buy prints through the site-
Select/tick any images you would like, in the middle at top click buy and choose how you want it printed cropped etc.
(some other on-line photo printers will not give you option to change crop of image and will cut heads off etc.)
I do recommend Photo box to buy quality images from but it is upto you x