I've ticked "Hide Other Objects" to speed up the display. While this has made the eyes vanish, the rest of the body wasn't even on-screen yet it has made Poser considerably more responsive. Looking at the mesh above the eyebrows we are going to "pain" where we want the wrinkles. Click on a face/facet to select it (and add it into the current group) or hold down the CTRL key while you click a facet to remove it from the current group. You can also "marquee-select" (draw a box with the mouse by holding down the left button as you drag the mouse) to add/remove many facets at once (it may not be obvious but the bright white rectangle on-screen is the result of me "Dragging" to add many facets at once). Any facet which is "touched" by the select rectangle will be added to the group. For efficient creation of the morph shape you want it is sometimes easier to add large numbers of factes and then tidy up be removing the odd facet than by painstakingly adding each and every facet one at a time.