Note: You need to be have 'Workspace owner' permission to do the following.
There are 3 ways to get to the People page. If you have the 'People' feature turned on for the Workspace click on this tab. Alternatively If you have the 'Dashboard' feature turnon on, click on the 'Add or Remove members' button. If you have neither then click on the 'Settings' link and then the 'People' tab.

You can now add people to the workspace by clicking on the 'Give someone access to this workspace' button:

(I've cropped the above image so you can see it better).
Now simply follow the 3 steps:
When adding someone new by clicking on 'Add someone new' you are presented with:
Here you can enter a email address, or a list of email addresses (comma or semicolon seperated). Alternatively clicking on 'Add from my address book' link you can import contacts from Outlook, Gmail, Yahoo, AOL and more.
Once you've added the person to the workspace the list is updated:
Here you can see information like when they last logged in to Glasscubes and their permission to this workspace. You can change their permission anytime by clicking on the 'Change their permission' link.
If you are an Admin on the account - you can manage all the users , workspaces and permissions on the same page by going to the 'Admin area' and selecting 'Security' tab.
GlassCubes does not support Internet Explorer 6. Upgrade to a newer version or download and use an alternative browser from the links below: FireFox Safari Google Chrome Latest IE
IE6 was released in 2001 - its very old, has many security weaknesses and you are very susceptible to virus, phishing, harmware.