Create a page with wordpress with posts by date (with their feature picture)

I have a theme for wordpress called MeGusta Installed on the site. The site is a comic strip right now the site shows you latest post first and thats ok but I want to add button for our new visitors where they can read our comics from 1 to the latest post. Additional to creating this page I need to put the button on the header on the right side of the site. The theme adds the file in a very wierd place. thanks for your help. Our site is [login to view URL]