buddyg on "[Plugin: WordPress SEO by Yoast] how to deactivate WordPress SEO plugin by Yoast"

i installed WordPress SEO plugin by Yoast in my old blog, i find it difficult setting everything, so I decided to just deactivate it and to continue using my old plugin the - all in one SEO pack. Unfortunately I cant fine the way to deactivate the WordPress SEO plugin by Yoast. Kindly help...

http://wordpress.org/extend/plugins/wordpress-seo/