There is no join form and nothing to fill in.
Go to the pinned OpenKaggle bench issue and leave this one comment:
am I at the bench? 🦆
The workflow reads the identity from your GitHub comment, so please do not add a username, email address, or personal details. GitHub will notify you if a membership invitation is available.
Joining is optional. It does not grant write access to every repository, and you can contribute through issues, discussions, pull requests, and shared research either way.
Only your own comment can request an invitation for your account. Public
commenters cannot request or spend invitations on behalf of someone else. If an
organizer needs to help a specific person after a capacity limit clears, they
can use the maintainer-only command /invite @username on the bench issue.
Please keep credentials, private datasets, and restricted competition materials out of the public thread.