You can recommend candidates to any project even if you are not an owner or a member. For such projects, you are a contributor and you can Recommend from your network.
In the Contributor view for a project, you can recommend candidates, add a note for the project members to read, and track your recommendations under Recommended by you.
Review the matches that Consider has found and click Recommend to send them to the project members for review. Your recommendations are then reviewed and accepted into the project. Whether you Recommend or Skip, Consider learns from your activity.