For future reference if other people are reading this, regarding the Website Address bit.
You can leave this field blank, and the site will create a URL for you based on the organisation's name. e.g., if you enter "My Lovely Website" as the name then you'd get the URL https://e-voice.org.uk/my-lovely-website
If you want something different then enter this on the form, but without the domain name part. So, if you wanted the URL "https://e-voice.org.uk/mysite" then you would just put "mysite" in here.
In any case, whatever URL you choose, you can later register your own domain name if you wish to, and associate this with your e-voice site. So you could have www.my-lovely-website.com if you wished! There are instructions for how to do this in the documentation.