Wordpress Plug-In install (Simple!)

Going crazy trying to get this simple plugin working in my Wordpress. The plugin is here: [login to view URL] You can download it there. It's free. It's a wordpress plugin. When I install I get different errors and can't get it running. I am with Hostgator. Problem: I just need this installed and working. What I am having problems with is when you click on the 'UPDATE & TEST' button, I get such as: 1. You do not have sufficient permissions to access this page. or 2. Sorry, there was a problem submitting the test article for dir_id 33566 to /wp-content/plugins/unique_articles/[login to view URL]: Error message: does not exist on /wp-content/plugins/unique_articles/[login to view URL] . If you can download it, and install it yourself on your own server or host to try to get it to run. Really simple to install but I get these errors I get confused and frustrated. If you can get it going. I'll select the first user. Please make sure you can get it FULLY running and can understand errors of Wordpress plugins and chmod files because you will run into this problem when I give you access to my server to fix the problem. NEED THIS DONE ASAP ---! WILL PAY TODAY IMMEDIATELY ONCE DONE