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https://www.magentocommerce.com/magento-connect/testimonials-slider-2.html

log out and login again, or you will get a 404 using the first time

Content 

make a cms page with URL Key ="testimonial" and put this line of code in content 
{{block type="testimonials/index" name="testimonials_index" template="testimonials/testimonials.phtml"}} 



Sidebar 

{{block type="testimonials/index" name="testimonials_index" template="testimonials/sidebar.phtml"}}