Usage patterns
〈場所〉のメンバーになるto become a member of (a group/organization)
He became a member of the soccer club.
メンバーを募集するto recruit members
We are recruiting members for the new project.
メンバー全員が〈動詞〉all the members do (something) together
All the members gathered and started the meeting.
〈人〉をメンバーに選ぶto choose someone as a member
We chose her as a member of the team.