Press "Ctrl+M" on the keyboard to create a new, blank slide. Click in the title box and type: "Index."

Navigate to your table of contents slide, then select one of your slide titles. Press the Insert tab and select Link. Under the Insert Hyperlink dialog box, select Place in This Document. Under Slide Titles, select the corresponding slide that you want to link to that title. Press OK. Repeat these steps for each slide in your table of contents.

Create a new slide to act as your Table of Contents. Scroll the Thumbnails Pane on the left to find the slide you want to add. Drag and drop it on the slide. You can see an example of this style below. An image of each linked slide is added to the contents. In Presentation mode, these are clickable and will take the viewer to that slide.