To invite someone to a Space, go to the space and click the Invite button. If you are an admin, or the option to allow members to invite people has been enabled, you can invite new members.
When selecting Invite, new people can be added by entering their email address.
When entering an email address or a name, once the value is correct, a drop down box will appear below the text field:
You must click on this email to add the person to the list of invites. If you don't click on it, the person / email address will not be invited.
You can also invite them as an admin (all people will be given admin access.. if you don't intend this, deselect admin and you can upgrade users to admin once they have accepted the invitation).
Enter a custom note to your invitation that will be included in the email invitation (optional) and click on the "invite people" button. Invited members will receive an email from you and a link to accept the invitation.
To remove members from a Space or change their permission level (Member or Admin), go to the Members tab
To promote to admin:
To remove a member: