To create your own customized webpage, open website configuration first. Follow this process to reach to web manager. How to open Twirll Web Manager
Step 1: Once you click on Web Pages page in side bar it will open the settings, there you can create web page as per your requirement. See below screenshot:
Step 2: Tap on New Page to create new web page
Step 3: Enter the page name and then if you have any existing HTML file then first tap on the text-field and then select HTML as shown on the image gven below, and add your HTML code.
Step 4: Now Add created web pages in the home page section, as shown in the below image, and then Save.