You have a couple of options when rescheduling stages of your sequence.
Reschedule a sequence for an individual recipient
Go to your Outbox. Search for the recipient’s email address.
Then, check the box next to the recipient(s) you’d like to reschedule, and click Reschedule. You will need to reschedule each stage separately.
Changing the interval between sequence stages
Changing the interval between sequence stages will only affect the recipients who have yet to receive the previous stage.
To change the interval between stages in your sequence:
From the Sequences page of the dashboard, click the sequence you would like to change.
In the Stages tab, select the stage you would like to reschedule in the left panel.
Edit the number of days between this stage and the prior stage.
Click Publish changes.