To enable this on a form in the old dashboard, right-click your formaloo in the dashboard and choose “View responses”. Then go to the “Share” tab, and click on the “Customized link (custom domain)” link.
On the opened page, enter your desired domain/subdomain & hit save. Please note that if your CNAME record hasn’t been propagated yet, you can’t save it here.
In the old dashboard, open your app by clicking it. Then choose the “App settings” option. Your app should have the public view enabled to accept custom domains. So go ahead and enable the public view option.
When you do so, it gives you the option to enter a custom domain for your app. There, you can add a custom domain for your app.
You can also change the URL ending of your app here. Ensure to save changes before closing this window.