Once you have completed the settings of your Dynamic Search Campaign, and then defined the target channel, it is time to 'submit' or 'run' the job.
Use the play button to manually run a job ()
Use submit to demo if you want to test that the keywords, ad groups and ads are acceptable according to the specific media channel you are targeting. Also, running to demo will show you the number of changes that will occur by should you run live (no. of new ad groups, no. of ad groups being paused, no. of new keywords etc.). You can check the results of your submission through the Creation Results menu under the Campaigns tab.
Don't forget to click "Run".
*Note submitting to Demo will not make changes to your selected Target Channel. This is a "dry" run.