# Join a Project
Join Projects to contribute measurements and receive notifications when new posts are made to the discussion.
When you visit the Project page, click on Join in the left menu bar.
When you visit a new Project click on Join.
When you click on a new Project click on Join in the right menu bar.
Some Projects cannot be joined, since they are limited to a closed group of users (indicated by the lock icon). If you are interested in joining, ask for an invitation as a collaborator.