Underneath "Cohort B", "Cohort C", Cohort D" and "Cohort E", you'll follow similar steps which are to click the "+" sign underneath each branch to add workflow actions steps. Select the "Delay" step first and choose a corresponding hour that is later than when the first email was sent. For example, the "Cohort A" will have it's emails delivered at 10:00am, so for Cohort B, we'll select 11:00am, for Cohort C, we'll select 12:00pm, for Cohort D, we'll select 1:00pm and for Cohort E, we'll select 2:00pm.