It's possible to open a Qonto account if:
You are a director of the company;
If you have a proxy;
In both cases, go to https://welcome.qonto.com/!
If you are a director, follow the classic register, by clicking on one of the names displayed. If you're a direction but don't show up in the list, click on "A director not listed here".
On the other hand, if you're not a director, but want to sign up on behalf of one of them, click on the message displayed at the bottom of the list.