The switch that sends a invitation to the tenant portal is available only when the rent payments system is desired. 

We made the tenant rent payment service optional! On the screen shown below, there are two radio buttons. You can choose which one you want. 

When the the tenant rent system is not activated by you, there will be no access to the tenant portal.

To select the rent payment system use this screen, which is found in your "My settings"

You find you "My Settings" navigation under your name in the dashboard page header.