You can setup Hot Water Schedules for your Thermostat in the Schedules page of the App or Web Interface. If the Hot Water option is missing, please ensure that your Boiler Type (Found under settings) is not set to Combi.
Once you have set your schedule, please ensure Hot Water is set to Auto so that it follows your schedule.
Please follow the video guide for step-by-step instructions on how to set these up.