...

• Use plus icon button to utilize sample cron expressions, clear the contents of the Cron Expression input before using a sample expression. This trigger type is useful if you have a requirement to schedule builds at a certain time of day, like 7:00 am.
• If Release is selected and that specific Release is in Started mode, at the end of successful build due to Poll SCM trigger it will trigger creation of new release snapshot.
• Click the Save button to save the changes.

Scheduled Deploy

Use this trigger type to schedule deployments to an environment at a certain time(s) using a cron expression. Select the Deploy Environment, Stream & enter values for cron expression, project deploy workflow inputs (if any) and Flexfields (if any).

• Use plus icon button to utilize sample cron expressions, clear the contents of the Cron Expression input before using a sample expression. This trigger type is useful if you have requirement to deploy at certain time of day, like 8:00 pm, to a Development environment.
• Click the Save button to save the changes.

Post Build Trigger

Use this trigger type to trigger a Deployment after any successful Build of this project. This will be fired immediately after any kind of successful build (Manual or Scheduled or Poll SCM Trigger).

...