You will need to sign up for several things depending on your level of involvement in the community.
Subscribing to discussion groups: Listserv
Filing bugs and subscribing to bug updates: Launchpad
Attending community meetings: Google Docs & Calendar
Hosting community meetings: Zoom (Evergreen account)
Updating this wiki: DokuWiki
Contributing translations: Launchpad and POEditor
Contributing documentation or code:
Git