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need help quickly plzzzzzzzzzzzzzzz to edit drupal theme

i want someone to help me editing that theme very soon

i want to edit drupal theme

pinboard drupal theme is beautiful pinterest clone theme
it has most of function of pinterest.com
the theme entrance show posts on 5 columns
I want to change that style to 3 or 2 or 1
I contact the theme owner how to change it
they answered me " You'd need to edit the CSS file(s) for the theme and possibly the .tpl file with the pin displays "
the theme demo : http://www.themesnap.com/themedemo/905
the theme official page : http://www.themesnap.com/premium-drupal-...board.html
download theme :http://www51.zippyshare.com/v/30457509/file.html

exaples of websites witch have 1 or 2 or 3 column posts

http://fancy.com/

http://www.archello.com/en

http://www.polyvore.com/

photos explain columns http://www.freeimagehosting.net/9a35z
http://www.freeimagehosting.net/vks9i

mywork