How to install a provider not on the listed one in Zwitzerland?

Hi there, when I want to use a provider on nextcloud I get here in Zwitzerland a list to choose from. My provider is not on the list - but I want to geht him connected. What must I do? I have the URL - but where do I have to fill it in? thanks…

I would recomment to contact the Nextcloud team using the provided email address on the following website:

Thanks I will try that way…