You can create schedule from the Settings section either by adding new schedule or by creating clone of existing schedule.

Add new schedule

• Go to Settings > Schedule
• Click the Add Schedule button in the top right corner
• In the screen that appears, select applicable values for each field 
• Click on Save

Create clone of existing schedule

• Go to Settings > Schedule
• Hover on existing schedule and click on Clone icon > Schedule will get copied!
• Click on the copied schedule and change the rule that needs amendment
• Click on Save

To know more about -

1. Settings that can be controlled via schedule, you can visit Schedule + Workflow
2. Managing schedules, you can visit Edit, delete and manage workflow schedules