From the Web-App menu select New Web-app or press ⌘-N on the keyboard to open the New Web-app sheet.
Enter the information requested:
App Name is what appears in the tab in Hana.
App URL is what address the web-app uses.
User Agent is the application name that Hana will tell your web-app you are using when you are using Hana.
Click Okay and you are done!