It should be straightforward but the link is broken and I haven't been able to find an alternative.
Edit : I know the usual procedure would be to go to powerups/admin, which I have done. I created my API key as instructed but am stuck trying to get the token because the link pointing to the right page is broken for me (see picture below). I haven't been able to find the URL it is supposed to redirect to nor a workaround.
2nd edit : We discovered that the link works fine on the english page but is broken on the french page, which we were accessing until now ; just a technical issue on the website.