Automatic:

1. add the keywords you want in "Cron Settings Section"
2. Press save settings 
3. Go to your hosting admin panel
4. Click on your cron job
5. Choose the time you want for it. The best should be one time per day.
6. Select " cron.php " in your root.

Manual:

1. add the keywords you want in "Cron Settings Section"
2. Press save settings 
3. go to your browser www.yoursite.com/cron.php and run cron every time you want new keywords added.
4. Keywords will be added to your list organically.
5. press "Refresh Page" button to see how many keywords are left!