The materials we need to prepare are: computer and ppt slides.
1. First, we open the ppt slide to edit and click Insert.
2. Then we click "Shape" in the open submenu to select a straight line.
3. Then we can click on the blank space of ppt slide and underline it.
Ppt, Microsoft Office PowerPoint, refers to Microsoft's demonstration software. Users can make presentations on projectors or computers, or they can print them out and make them into films, so they can be used in a wider range of fields. Ppt can not only make presentations, but also show them to others online.