Plugin Won't Work - Messed Up My Website

This plugin has totally not worked for my website. I installed it, made sure the settings where correct and I successfully seen the Login or Register links. I clicked any of them and it just kept refreshing my page. So, I left it activated over night, but when I came back on today, my admin bar for WordPress was gone, and all of my footer contents on WordPress are also missing.

I'm pretty sick of this, I paid $39.00 for this plugin and I should expect it to work seamlessly. Of course, I'd expect errors here and there, but I've searched the forums and could not find a suitable explanation.