A trigger is a feature that defines when your campaign will show. There are several different ways to trigger your SleekBoxes*.
The first thing you'll obviously have to do is create a campaign that you would like to trigger. (Or pick a campaign that you've already created and then edit it.)
Next, go to the step 'Settings' and choose 'Add another trigger':
There are five different options:
*Note: SleekBars do not have triggers and will show right away.