Ok from here you have two options available:
1) Dont know if you have done this already but you will need to go to wp-admin >> plugins (its at the left of the wp-admin dashboard beneath “appearance”) from here if all is well with your manual upload you should see your plugin title in the main area, just click activate plugin.
2) If its not there, then remove the files you have uploaded and go back to wp-admin plugins, at the top you see an area where it says “Plugins” and a button that says “Add New”, click “add new” button and the page will re-load. Use the Search for the plugin from the wp repository (search for its title) and grab it from there, just follow the onscreen instructions.. very easy..