Here are examples of images that normally appear with a Web App export from InDesign and in5.
E.g., for a non-mobile device:
E.g., install screen on an iPad to install to the Home Screen.
Removing the device limitations
If you don't want the Web App to be limited to mobile devices, and/or you'd like to remove the instructions screen, the following bit of custom code changes the output so that image of instructions doesn't appear and the page simply loads as a web page (but still allows the Web App installation on supported devices).
Attach the following as a .js file in the Resources section of the in5 dialog:
limitWebAppToDevice = false;
More info on attaching a .js file: How to attach resources
This will not remove the install screen on your target device(s). If you want to remove that screen as well, see the method below.
Removing all limitations and install instructions
Alternatively, if you use the Presentation Mode panel (in5 > Enhancements), you can turn on the Save to Home Screen feature without using any of the install screens shown above.
Make sure that you disable all other options, as they can interfere with normal navigation.
Finally, export your project using the Web option (not Web App, because that will include the install screen).
This method removes all instructions, and simply makes it possible to save the Web App to the user's Home Screen.
Temporarily test Web Apps as web pages
Alternatively, if you want to temporarily bypass the install screens (on any device) and treat the content like a web page (instead of a WebApp), you add ?webapp=0 to the end of the URL (e.g., http://example.com/myapp/index.html?webapp=0).