Trouble installing WP Back up plugin

Hello,

here are the instructions that come with the plugin.
1.Extract the wp-db-backup/ folder file to /wp-content/plugins/
2.Activate the plugin at your blog’s Admin -> Plugins screen
3.The plugin will attempt to create a directory /wp-content/backup-*/ inside your WordPress directory.
4.You may need to make /wp-content writable (at least temporarily) for it to create this directory. For example: $ cd /wordpress/ $ chgrp www-data wp-content (where “www-data” is the group your FTP client uses) $ chmod g+w wp-content

I did step 1 and my plugin is still not seen in my WordPress admin page.I tried some things and understanding steps 3 and 4 and it didn’t work. I have no clue what they mean with their last example. I clicked on the directory of wp-content and changed permission to “write public” and it didn’t work….is that what i was supposed to do?

I’m a newbie at this so I would appreciate breakdowns of technical terms and actions 🙂 Thanks

Carl