In the documentation, you’ll find how to configure the form in the webkit.
At the moment the form is configured like this:
<Form data="14210" />
That means the form is loading from here: https://edgeryders.eu/t/14210 - which is the co-working event.
I suggest you create a new form following the documentation.
Take note of the topic_id of the form, and in the site configuration change the data parameter of the form as shown in the manual:
<Form data="new_id" />