When using the Add PI or Move PI command under the Vertical Curve Set tools, there is no dialog appearing to place or move a PI.
These commands do not have a dialog box or a pop-up window for settings. When you access the command it prompts the steps required at the bottom of MicroStation to 'Identify the Start Point' or 'Identify Alignment End' when placing a PI, and it will prompt you to 'Identify Element' when you are moving a PI. Graphically select the location of the points and you will have the ability place and move the desired PIs within the profiles.