To open the Translate tool, double-click on "Translate" in the Toolbox.
To interactively translate selected points, LMB Drag in any Camera View while Translate is the Current Tool. As you drag the mouse, any selected points will be translated along the two axes that arent Active. To translate selected points along the Active Axis, hold down either control-key while you LMB Drag. In either case as you drag the mouse, the polygons will move in increments set by Sensitivity.
Alternatively, you can translate points in specific amounts by entering values in the Distance X, Y, Z controls.