Your normal username/password should automatically work at foundation.wiki.  

There will be a small addition to this page later, but they promised me that everything that's on the page is final and official and ready to be translated.  We have several months to get this done, but it's an important change, and I didn't want to wait until the last minute.  I would like to see it translated into as many languages as possible.

There is an associated page at https://meta.wikimedia.org/wiki/Access_to_temporary_account_IP_addresses_FAQ

Thank you for your help.