You may choose to move, modify the intensity, lengthen or shorten the viseme, and replace it entirely. Use the Zoom controls on the right toolbar for zooming efficiency and enable accurate editing.
To edit visemes, you must select a specific viseme so put the Zoom commands to good use.
After you have zoomed in on the specific viseme you want to edit, click it once for selection.
The fastest way is to click on it twice to call up the editing dialog box. Go to #5.
There are a few methods here. One is to access the Visemes window in the Accessories window by clicking on the tab, dragging, and then releasing a specific viseme into the selected area. The cursor will transform into a mouth when it is dragged into this area.
The other method is to right click in the selected viseme area and a menu will appear.
You may Edit Selected Viseme..., Delete or Remove All Visemes here. Choose Edit Selected Viseme... to replace this viseme.
Click OK after you have selected and have altered the intensity by dragging the slider left to decrease or right to increase.
You may also go through the menu HAP > Edit Selected > Viseme. Click OK after selecting.