Preflop, you'll definitely want ATS (attempt to steal), and you'll probably eventually want PF-3bet and fold-to-pf-3bet.

You can easily change the popups the same way you change the other values. Open the configuration screen, select the popup you want to modify in the "Group" tab, then click over to the "Stats" tab to modify the information available in that popup. If you want to add/remove entire popups from displaying when you click the HUD, click the [Player] group in the "Group" tab, and then on the right add/remove what popups show up in the "Popups" table.