recent product

hi, i would like to ask how i can make my recent product from 4 column to 5 column?
i had change the short code below
[recent_products per_page=”5″ columns=”5″], but unfortunately , it not work.

http://www.inetolgift.com/cms/home

& the image size is enlarged, & it become blur, i just want it be 150px 150px

anybody can help me solve this?

http://wordpress.org/extend/plugins/woocommerce/