How to log in on support page when "atlassian-URL" can not be found?

Question

I need support. There seems to be no other possibility for contact as the Atlassian Support page. On this page I am asked to log in via "the site URL of your app within your organization". However, I can't find this URL anywhere. 
The URL in my navigation bar does not look anything like the example "mysitenam.atlassian.net" and is not accepted.

My questions
Where or how do I find the right URL for loggin in on the support page?
Is there a support team to whom I can send my question?

Nb. The question I am asking for support for has also to do with loggin in, but then to our paid account subscription

dM_x357fh · Answer

No.  That instruction set takes you right back to the URL page.

No help.

Sakshi Verma · Answer

Hi @Nico van Dalen  ,

I see you have a Standard subscription for Trello, and you should be able to raise a ticket for Trello.

You can go to https://support.atlassian.com/contact and select the product (Trello ) and raise the request.

Let me know if you face any issues and I will help you further.

Thank you !