Become a member
Becoming a member is available to some coordinator roles, to Guardian Angels and to managers of Organizational Members. When you become a member - it's similar to logging in as that member as you see everything that that member would see when they login, and in addition you can take actions on behalf of that member.
When you have become a member, you will see the following text right below the menu bar:
Acting as Member name · Return to your name
This indicates that you are now acting on behalf of the member you just became. If you click on the link Return to your name you will be logged in as your original member account and can become other members if needed.