You can use maintenance periods to communicate with your customers when parts of your service will be down for maintenance.
Login to your status page at instatus.com/login then choose your status page.
Go to maintenances, then click on Schedule a maintenance button:
Once you click it, a new form will appear. Here you can enter:
Click Add maintenance, and it will be added to your page.
Go to maintenance, then click on the maintenance that you want add an update to.
You'll find the list of maintenance updates, click on Add an maintenance.
Once you click it, a new form will appear. Here you can enter:
Go to maintenances, then click on the maintenance
Click on Edit maintenance button on the top right. Write your new maintenance title