How to use the Insertion Point placeholder text properly?

My issue is two-fold here, and perhaps there is one answer that connects to both problems....

1.  When I add a Text Field onto stage, and right click over this text field, I cannot add an Insertion Point in order to display placeholder text

2. When I add a subform onto stage, I can then add an Insertion Point within the subform, but when I preview as PDF or save this document as a PDF, and click over the place holder text it does not go away.  It remains there.

What am I missing in order to have the Placeholder text go away once a user clicks on it?

Thanks