the UI won't let me finish the initial survey 🙂

That's not great 😅 Can you try clearing browser cache? If the issue persists we'll try to do a hot deploy of a fix. Just for our info, which browser are you using?

it's Firefox 93.0, Linux Mint 20.2. in the end, when I created the instance, the modal appeared again and I submitted it without problems also, sorry if this is not the most appropriate place to report bugs!

It is, thanks for letting us know. We'll look into making it more robust. There's a change upcoming that will likely fix the issue 👍