Once you have set up your entry rule and goal(s) and have added any relevant auto-messages and/or auto-actions, you will be able to set your campaign as live.
If your campaign has been sitting idle (either in draft mode or paused) for some time, we highly recommend re-saving your entry rule to bring the campaign up to date.
First, make sure all of your auto-messages and/or auto-actions have been set live. To set them live, you will click into each of them individually and click the green Set Live button at the top-right of the screen. Once activated, these messages and actions should show as green and "Active" within the campaign.
Once you have turned on all of your auto-messages and/or auto-actions within the campaign, scroll to the top and click the green master Start button at the top-right of the campaign.
You will likely not see contacts pull in immediately. Auto-Campaigns are forward-looking by nature. Only clients who meet the campaign entry rule going forward will be pulled into the campaign.