Members are the people who can open a workspace.
How do I invite someone?
Open Settings, then Members. The page says "Manage members and invitations for this workspace."
Under Workspace Members, find "Invite someone to this workspace by email address".
Type the email address.
Choose a role: Admin, Editor or Member.
Click Send Invite.
What does the page list?
A line shows how many members are active and how many invitations are pending, for example "3 active members • 1 pending invitation". Each row has the person's name, email and role: Owner, Admin or Editor. You are marked (You). An invitation that has not been accepted shows Invitation pending and Pending.
Can I invite people when I create a workspace?
Yes. The Create a new workspace window has a Members box. See the article on workspaces and spend limits.
Good to know
Invitations are sent by email. Check the address before you send.
The names of the roles are shown in the app. Its pages do not describe what each role can do, so ask your admin if you are unsure.