Account owners can invite colleagues in Settings → Team.
Enter their email address under Invite by email.
Choose a role: Member or Owner. See Roles and permissions for the difference.
Send the invitation.
Your colleague gets an email with a link to join. Until they accept, they appear under Pending invitations.
If you see Invitation saved, email was not sent, the invitation exists but the email didn't go out. Delete it and invite them again, or message us using the chat.