Create a new page on your website with a top bar menu item or a sub menu. Name that menu page, it something like Secure Workspace, My Secure Workspace, etc...
You can also add a button that links to this Secure Workspace page and it does not have to be a top line menu item.
In either case you need to create a new page to your website to add the NINJAworkspace Iframe.
See instruction below… You will copy and paste the code to a new page with an HTML block/window on it.
The workspace owner has the option to ADD all new users to his contact list automatically. Check instructions here.