"Post Delay" is the delay after the program has run. Trigger input will be ignored during post delay so that the program won't continue to be triggered right away. The PicoBoo controllers have up to 2 minutes of animation time which also includes post delay time. To record a post delay into the PicoBoo you simply do nothing after programming before pressing the REC button to save (for example, press REC to start recording, press 1 & 2 buttons any way you'd like to program, then simply wait a number of seconds before pressing the REC button to save)
If you require more than 2 minutes (minus your program time) of post delay then you will need to use the Simple Timer. By using the Simple Timer you can have up to 60 minutes of post delay time.