Interactive Web Application Is it possible to use Blender for creating an interactive Web App, so that you can change some values in HTML form and by clicking a button, apply them to the script /model? 
I downloaded Blend4Web Addon and exporting a scene as HTML works but its static and cant interact with my form
Yes it possible, but in your case you should do this. 

Instead exporting scene, you should open blend4web projects manager 

 

Here you can create a new project



In projects, blend files are assets, they will be used by script files.

In projects manager you will find blend files, exported scenes as json files and JavaScript files to work with:



You can edit Script files using any text editor or from project manager:



here you can find more information about it:
https://www.blend4web.com/en/community/article/341/