You may learn that someone is interested in receiving marketing messaging from a certain sequence you've put together. Maybe they missed one of the trigger timeframes and have expressed interest. Or maybe you have someone that just wants to be sent through a sequence of messages again.
You can enroll them manually by clicking Marketing > Sequences > selecting a sequence
Then clicking the dropdown to the right > clicking 'Manually enroll a customer'.
Select them and enroll them.
Don’t have Marketing on your account? Activate it directly under Apps & Integrations > App Store > Email & SMS Marketing Suite.