tonio113
At the moment, the Contact form of the Gk Box does not work, We will update and remove this form in the next version of the theme.
In your case, you can download the files in this link: https://www.dropbox.com/s/5d3r9fv2f6dwtds/new-file.zip?dl=0
1. Unizip this file and override 3 files into your theme folder.
2. Install the Contact Form 7 plugin.
3. Add the following code in the Contact > Add new.
<fieldset><legend>Send an Email</legend>
<label>Name:
[text* your-name] </label>
<label>Email:
[email* your-email] </label>
<label>Message:
[textarea your-message] </label>
</fieldset>
[submit "Send Message"]
4. Copy the contact shortcode.
5. Go to the Widgets menu > add the Custom HTML widget to the Shortcode Contact Form sidebar.
And paste the contact shortcode into the Custom HTML widget.
See the screenshot: http://prntscr.com/mf4joi
With Contact form 7 you can enable the captcha in the setting section of the plugin.
Regards,