Head over to Adalo's dashboard and hit "Create New App." Pick either a native mobile app or a web app, depending on what you need.

Adalo has a bunch of templates. For a customer support portal, starting with a Blank template is a good idea. It gives you full control over the design and features.

1. Drag and drop a "Screen" component onto your workspace.
2. Add a header and set the text to "Customer Support Portal".
3. Add a menu or navigation bar so customers can move through different sections of the support portal.

1. Drag and drop a "Form" component onto the screen.
2. Customize the form to include fields like Name, Email, Subject, Description, and Priority Level.
3. Make sure the form inputs are linked to a "Tickets" collection in your database.

1. Go to the database section in Adalo and create a new collection called "Tickets".
2. Define fields for the collection such as Name, Email, Subject, Description, Priority, Status, and Date Created.
3. Ensure each form input is correctly mapped to these fields.

1. Drag and drop a "List" component onto a new screen.
2. Link this list to the "Tickets" collection.
3. Customize the list to show important fields like Subject, Status, and Date Created.
4. Enable the option to filter the list by user so customers only see their own tickets.

1. Create a new screen to display individual ticket details.
2. Include fields like Subject, Description, Priority, and Status.
3. Allow customers to update certain fields like the status of the ticket by using a "Form" component linked to the "Tickets" collection.

1. Add a system to send email notifications when a new ticket is created or updated.
2. Use Adalo's "Zapier" integration or custom actions to trigger an email notification.
3. Ensure you have an "Email" field in the "Tickets" collection to use as a recipient address for notifications.

1. Use Adalo's preview feature to test the functionalities of your customer support portal.
2. Make sure the form submissions, ticket listings, and ticket updates work as expected.
3. Test email notifications to ensure they are sent and received properly.

Once everything works correctly, go ahead and publish your app. For a web app, deploy it to a custom domain. For a native app, follow Adalo’s publishing guidelines for iOS and Android platforms.