category to a page, cant find a solution

i know admin of the forum , that probably this request it's been answered somewhere
but i searched a bit and still i can't get out of this problem

i just want to put all posts under a category on a single page.

my site is http://www.lollando.com

i want to put the category "lapponia" into the page Lapponia and see all the photos into one page.

i downloaded and installed cat2page plugin but the instructions say to modify the archive.php page that into atahualpa doesn't exist.

any help please ?